author | rehn |
Fri, 29 Nov 2019 12:09:25 +0100 | |
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/* |
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* Copyright (c) 1998, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "classfile/vmSymbols.hpp" |
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#include "logging/log.hpp" |
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#include "logging/logStream.hpp" |
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#include "jfr/jfrEvents.hpp" |
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#include "memory/allocation.inline.hpp" |
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#include "memory/metaspaceShared.hpp" |
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#include "memory/padded.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "memory/universe.hpp" |
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#include "oops/markWord.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/atomic.hpp" |
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#include "runtime/biasedLocking.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/interfaceSupport.inline.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "runtime/objectMonitor.hpp" |
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#include "runtime/objectMonitor.inline.hpp" |
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#include "runtime/osThread.hpp" |
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#include "runtime/safepointVerifiers.hpp" |
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#include "runtime/sharedRuntime.hpp" |
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#include "runtime/stubRoutines.hpp" |
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#include "runtime/synchronizer.hpp" |
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#include "runtime/thread.inline.hpp" |
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#include "runtime/timer.hpp" |
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#include "runtime/vframe.hpp" |
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#include "runtime/vmThread.hpp" |
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#include "utilities/align.hpp" |
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#include "utilities/dtrace.hpp" |
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#include "utilities/events.hpp" |
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#include "utilities/preserveException.hpp" |
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// The "core" versions of monitor enter and exit reside in this file. |
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// The interpreter and compilers contain specialized transliterated |
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// variants of the enter-exit fast-path operations. See i486.ad fast_lock(), |
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// for instance. If you make changes here, make sure to modify the |
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// interpreter, and both C1 and C2 fast-path inline locking code emission. |
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// |
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// ----------------------------------------------------------------------------- |
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#ifdef DTRACE_ENABLED |
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// Only bother with this argument setup if dtrace is available |
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// TODO-FIXME: probes should not fire when caller is _blocked. assert() accordingly. |
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#define DTRACE_MONITOR_PROBE_COMMON(obj, thread) \ |
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char* bytes = NULL; \ |
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int len = 0; \ |
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jlong jtid = SharedRuntime::get_java_tid(thread); \ |
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Symbol* klassname = ((oop)(obj))->klass()->name(); \ |
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if (klassname != NULL) { \ |
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bytes = (char*)klassname->bytes(); \ |
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len = klassname->utf8_length(); \ |
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} |
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#define DTRACE_MONITOR_WAIT_PROBE(monitor, obj, thread, millis) \ |
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{ \ |
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if (DTraceMonitorProbes) { \ |
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DTRACE_MONITOR_PROBE_COMMON(obj, thread); \ |
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HOTSPOT_MONITOR_WAIT(jtid, \ |
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(uintptr_t)(monitor), bytes, len, (millis)); \ |
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} \ |
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} |
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#define HOTSPOT_MONITOR_PROBE_notify HOTSPOT_MONITOR_NOTIFY |
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#define HOTSPOT_MONITOR_PROBE_notifyAll HOTSPOT_MONITOR_NOTIFYALL |
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#define HOTSPOT_MONITOR_PROBE_waited HOTSPOT_MONITOR_WAITED |
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#define DTRACE_MONITOR_PROBE(probe, monitor, obj, thread) \ |
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{ \ |
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if (DTraceMonitorProbes) { \ |
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DTRACE_MONITOR_PROBE_COMMON(obj, thread); \ |
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HOTSPOT_MONITOR_PROBE_##probe(jtid, /* probe = waited */ \ |
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(uintptr_t)(monitor), bytes, len); \ |
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} \ |
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} |
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#else // ndef DTRACE_ENABLED |
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#define DTRACE_MONITOR_WAIT_PROBE(obj, thread, millis, mon) {;} |
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#define DTRACE_MONITOR_PROBE(probe, obj, thread, mon) {;} |
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#endif // ndef DTRACE_ENABLED |
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// This exists only as a workaround of dtrace bug 6254741 |
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int dtrace_waited_probe(ObjectMonitor* monitor, Handle obj, Thread* thr) { |
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DTRACE_MONITOR_PROBE(waited, monitor, obj(), thr); |
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return 0; |
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} |
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#define NINFLATIONLOCKS 256 |
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static volatile intptr_t gInflationLocks[NINFLATIONLOCKS]; |
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// global list of blocks of monitors |
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PaddedObjectMonitor* volatile ObjectSynchronizer::g_block_list = NULL; |
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// Global ObjectMonitor free list. Newly allocated and deflated |
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// ObjectMonitors are prepended here. |
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ObjectMonitor* volatile ObjectSynchronizer::g_free_list = NULL; |
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// Global ObjectMonitor in-use list. When a JavaThread is exiting, |
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// ObjectMonitors on its per-thread in-use list are prepended here. |
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ObjectMonitor* volatile ObjectSynchronizer::g_om_in_use_list = NULL; |
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int ObjectSynchronizer::g_om_in_use_count = 0; // # on g_om_in_use_list |
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static volatile intptr_t gListLock = 0; // protects global monitor lists |
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static volatile int g_om_free_count = 0; // # on g_free_list |
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static volatile int g_om_population = 0; // # Extant -- in circulation |
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#define CHAINMARKER (cast_to_oop<intptr_t>(-1)) |
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// =====================> Quick functions |
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// The quick_* forms are special fast-path variants used to improve |
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// performance. In the simplest case, a "quick_*" implementation could |
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// simply return false, in which case the caller will perform the necessary |
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// state transitions and call the slow-path form. |
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// The fast-path is designed to handle frequently arising cases in an efficient |
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// manner and is just a degenerate "optimistic" variant of the slow-path. |
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// returns true -- to indicate the call was satisfied. |
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// returns false -- to indicate the call needs the services of the slow-path. |
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// A no-loitering ordinance is in effect for code in the quick_* family |
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// operators: safepoints or indefinite blocking (blocking that might span a |
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// safepoint) are forbidden. Generally the thread_state() is _in_Java upon |
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// entry. |
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// |
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// Consider: An interesting optimization is to have the JIT recognize the |
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// following common idiom: |
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// synchronized (someobj) { .... ; notify(); } |
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// That is, we find a notify() or notifyAll() call that immediately precedes |
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// the monitorexit operation. In that case the JIT could fuse the operations |
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// into a single notifyAndExit() runtime primitive. |
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bool ObjectSynchronizer::quick_notify(oopDesc* obj, Thread* self, bool all) { |
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assert(!SafepointSynchronize::is_at_safepoint(), "invariant"); |
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assert(self->is_Java_thread(), "invariant"); |
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assert(((JavaThread *) self)->thread_state() == _thread_in_Java, "invariant"); |
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NoSafepointVerifier nsv; |
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if (obj == NULL) return false; // slow-path for invalid obj |
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const markWord mark = obj->mark(); |
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if (mark.has_locker() && self->is_lock_owned((address)mark.locker())) { |
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// Degenerate notify |
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// stack-locked by caller so by definition the implied waitset is empty. |
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return true; |
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} |
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if (mark.has_monitor()) { |
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ObjectMonitor* const mon = mark.monitor(); |
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assert(mon->object() == obj, "invariant"); |
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if (mon->owner() != self) return false; // slow-path for IMS exception |
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if (mon->first_waiter() != NULL) { |
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// We have one or more waiters. Since this is an inflated monitor |
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// that we own, we can transfer one or more threads from the waitset |
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// to the entrylist here and now, avoiding the slow-path. |
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if (all) { |
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DTRACE_MONITOR_PROBE(notifyAll, mon, obj, self); |
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} else { |
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DTRACE_MONITOR_PROBE(notify, mon, obj, self); |
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} |
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int free_count = 0; |
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do { |
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mon->INotify(self); |
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++free_count; |
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} while (mon->first_waiter() != NULL && all); |
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OM_PERFDATA_OP(Notifications, inc(free_count)); |
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} |
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return true; |
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} |
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// biased locking and any other IMS exception states take the slow-path |
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return false; |
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} |
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// The LockNode emitted directly at the synchronization site would have |
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// been too big if it were to have included support for the cases of inflated |
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// recursive enter and exit, so they go here instead. |
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// Note that we can't safely call AsyncPrintJavaStack() from within |
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// quick_enter() as our thread state remains _in_Java. |
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bool ObjectSynchronizer::quick_enter(oop obj, Thread* self, |
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BasicLock * lock) { |
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assert(!SafepointSynchronize::is_at_safepoint(), "invariant"); |
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assert(self->is_Java_thread(), "invariant"); |
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assert(((JavaThread *) self)->thread_state() == _thread_in_Java, "invariant"); |
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NoSafepointVerifier nsv; |
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if (obj == NULL) return false; // Need to throw NPE |
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const markWord mark = obj->mark(); |
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if (mark.has_monitor()) { |
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ObjectMonitor* const m = mark.monitor(); |
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assert(m->object() == obj, "invariant"); |
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Thread* const owner = (Thread *) m->_owner; |
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// Lock contention and Transactional Lock Elision (TLE) diagnostics |
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// and observability |
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// Case: light contention possibly amenable to TLE |
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// Case: TLE inimical operations such as nested/recursive synchronization |
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if (owner == self) { |
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m->_recursions++; |
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return true; |
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} |
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// This Java Monitor is inflated so obj's header will never be |
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// displaced to this thread's BasicLock. Make the displaced header |
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// non-NULL so this BasicLock is not seen as recursive nor as |
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// being locked. We do this unconditionally so that this thread's |
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235 |
// BasicLock cannot be mis-interpreted by any stack walkers. For |
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236 |
// performance reasons, stack walkers generally first check for |
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237 |
// Biased Locking in the object's header, the second check is for |
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238 |
// stack-locking in the object's header, the third check is for |
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239 |
// recursive stack-locking in the displaced header in the BasicLock, |
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240 |
// and last are the inflated Java Monitor (ObjectMonitor) checks. |
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241 |
lock->set_displaced_header(markWord::unused_mark()); |
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242 |
|
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243 |
if (owner == NULL && Atomic::replace_if_null(&(m->_owner), self)) { |
29070 | 244 |
assert(m->_recursions == 0, "invariant"); |
245 |
return true; |
|
246 |
} |
|
247 |
} |
|
248 |
||
249 |
// Note that we could inflate in quick_enter. |
|
250 |
// This is likely a useful optimization |
|
251 |
// Critically, in quick_enter() we must not: |
|
252 |
// -- perform bias revocation, or |
|
253 |
// -- block indefinitely, or |
|
254 |
// -- reach a safepoint |
|
255 |
||
256 |
return false; // revert to slow-path |
|
257 |
} |
|
258 |
||
6975 | 259 |
// ----------------------------------------------------------------------------- |
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260 |
// Monitor Enter/Exit |
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261 |
// The interpreter and compiler assembly code tries to lock using the fast path |
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262 |
// of this algorithm. Make sure to update that code if the following function is |
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263 |
// changed. The implementation is extremely sensitive to race condition. Be careful. |
6975 | 264 |
|
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265 |
void ObjectSynchronizer::enter(Handle obj, BasicLock* lock, TRAPS) { |
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266 |
if (UseBiasedLocking) { |
6975 | 267 |
if (!SafepointSynchronize::is_at_safepoint()) { |
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268 |
BiasedLocking::revoke(obj, THREAD); |
6975 | 269 |
} else { |
270 |
BiasedLocking::revoke_at_safepoint(obj); |
|
271 |
} |
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272 |
} |
6975 | 273 |
|
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274 |
markWord mark = obj->mark(); |
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275 |
assert(!mark.has_bias_pattern(), "should not see bias pattern here"); |
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276 |
|
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277 |
if (mark.is_neutral()) { |
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278 |
// Anticipate successful CAS -- the ST of the displaced mark must |
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279 |
// be visible <= the ST performed by the CAS. |
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280 |
lock->set_displaced_header(mark); |
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281 |
if (mark == obj()->cas_set_mark(markWord::from_pointer(lock), mark)) { |
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282 |
return; |
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283 |
} |
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284 |
// Fall through to inflate() ... |
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285 |
} else if (mark.has_locker() && |
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286 |
THREAD->is_lock_owned((address)mark.locker())) { |
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287 |
assert(lock != mark.locker(), "must not re-lock the same lock"); |
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288 |
assert(lock != (BasicLock*)obj->mark().value(), "don't relock with same BasicLock"); |
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|
289 |
lock->set_displaced_header(markWord::from_pointer(NULL)); |
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290 |
return; |
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|
291 |
} |
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|
292 |
|
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293 |
// The object header will never be displaced to this lock, |
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|
294 |
// so it does not matter what the value is, except that it |
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|
295 |
// must be non-zero to avoid looking like a re-entrant lock, |
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296 |
// and must not look locked either. |
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|
297 |
lock->set_displaced_header(markWord::unused_mark()); |
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298 |
inflate(THREAD, obj(), inflate_cause_monitor_enter)->enter(THREAD); |
6975 | 299 |
} |
300 |
||
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301 |
void ObjectSynchronizer::exit(oop object, BasicLock* lock, TRAPS) { |
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302 |
markWord mark = object->mark(); |
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303 |
// We cannot check for Biased Locking if we are racing an inflation. |
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304 |
assert(mark == markWord::INFLATING() || |
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305 |
!mark.has_bias_pattern(), "should not see bias pattern here"); |
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306 |
|
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307 |
markWord dhw = lock->displaced_header(); |
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308 |
if (dhw.value() == 0) { |
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309 |
// If the displaced header is NULL, then this exit matches up with |
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310 |
// a recursive enter. No real work to do here except for diagnostics. |
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|
311 |
#ifndef PRODUCT |
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|
312 |
if (mark != markWord::INFLATING()) { |
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|
313 |
// Only do diagnostics if we are not racing an inflation. Simply |
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|
314 |
// exiting a recursive enter of a Java Monitor that is being |
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315 |
// inflated is safe; see the has_monitor() comment below. |
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316 |
assert(!mark.is_neutral(), "invariant"); |
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|
317 |
assert(!mark.has_locker() || |
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|
318 |
THREAD->is_lock_owned((address)mark.locker()), "invariant"); |
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|
319 |
if (mark.has_monitor()) { |
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320 |
// The BasicLock's displaced_header is marked as a recursive |
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321 |
// enter and we have an inflated Java Monitor (ObjectMonitor). |
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322 |
// This is a special case where the Java Monitor was inflated |
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323 |
// after this thread entered the stack-lock recursively. When a |
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|
324 |
// Java Monitor is inflated, we cannot safely walk the Java |
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|
325 |
// Monitor owner's stack and update the BasicLocks because a |
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|
326 |
// Java Monitor can be asynchronously inflated by a thread that |
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327 |
// does not own the Java Monitor. |
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|
328 |
ObjectMonitor* m = mark.monitor(); |
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|
329 |
assert(((oop)(m->object()))->mark() == mark, "invariant"); |
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330 |
assert(m->is_entered(THREAD), "invariant"); |
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|
331 |
} |
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332 |
} |
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333 |
#endif |
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|
334 |
return; |
6975 | 335 |
} |
336 |
||
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|
337 |
if (mark == markWord::from_pointer(lock)) { |
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338 |
// If the object is stack-locked by the current thread, try to |
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339 |
// swing the displaced header from the BasicLock back to the mark. |
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340 |
assert(dhw.is_neutral(), "invariant"); |
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|
341 |
if (object->cas_set_mark(dhw, mark) == mark) { |
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342 |
return; |
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343 |
} |
6975 | 344 |
} |
345 |
||
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346 |
// We have to take the slow-path of possible inflation and then exit. |
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347 |
inflate(THREAD, object, inflate_cause_vm_internal)->exit(true, THREAD); |
6975 | 348 |
} |
349 |
||
350 |
// ----------------------------------------------------------------------------- |
|
351 |
// Class Loader support to workaround deadlocks on the class loader lock objects |
|
352 |
// Also used by GC |
|
353 |
// complete_exit()/reenter() are used to wait on a nested lock |
|
354 |
// i.e. to give up an outer lock completely and then re-enter |
|
355 |
// Used when holding nested locks - lock acquisition order: lock1 then lock2 |
|
356 |
// 1) complete_exit lock1 - saving recursion count |
|
357 |
// 2) wait on lock2 |
|
358 |
// 3) when notified on lock2, unlock lock2 |
|
359 |
// 4) reenter lock1 with original recursion count |
|
360 |
// 5) lock lock2 |
|
361 |
// NOTE: must use heavy weight monitor to handle complete_exit/reenter() |
|
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362 |
intx ObjectSynchronizer::complete_exit(Handle obj, TRAPS) { |
6975 | 363 |
if (UseBiasedLocking) { |
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364 |
BiasedLocking::revoke(obj, THREAD); |
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365 |
assert(!obj->mark().has_bias_pattern(), "biases should be revoked by now"); |
1 | 366 |
} |
367 |
||
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368 |
ObjectMonitor* monitor = inflate(THREAD, obj(), inflate_cause_vm_internal); |
6975 | 369 |
|
370 |
return monitor->complete_exit(THREAD); |
|
371 |
} |
|
372 |
||
373 |
// NOTE: must use heavy weight monitor to handle complete_exit/reenter() |
|
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374 |
void ObjectSynchronizer::reenter(Handle obj, intx recursions, TRAPS) { |
6975 | 375 |
if (UseBiasedLocking) { |
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376 |
BiasedLocking::revoke(obj, THREAD); |
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377 |
assert(!obj->mark().has_bias_pattern(), "biases should be revoked by now"); |
6975 | 378 |
} |
379 |
||
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380 |
ObjectMonitor* monitor = inflate(THREAD, obj(), inflate_cause_vm_internal); |
6975 | 381 |
|
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382 |
monitor->reenter(recursions, THREAD); |
6975 | 383 |
} |
384 |
// ----------------------------------------------------------------------------- |
|
385 |
// JNI locks on java objects |
|
386 |
// NOTE: must use heavy weight monitor to handle jni monitor enter |
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387 |
void ObjectSynchronizer::jni_enter(Handle obj, TRAPS) { |
6975 | 388 |
// the current locking is from JNI instead of Java code |
389 |
if (UseBiasedLocking) { |
|
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|
390 |
BiasedLocking::revoke(obj, THREAD); |
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|
391 |
assert(!obj->mark().has_bias_pattern(), "biases should be revoked by now"); |
6975 | 392 |
} |
393 |
THREAD->set_current_pending_monitor_is_from_java(false); |
|
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|
394 |
inflate(THREAD, obj(), inflate_cause_jni_enter)->enter(THREAD); |
6975 | 395 |
THREAD->set_current_pending_monitor_is_from_java(true); |
396 |
} |
|
397 |
||
398 |
// NOTE: must use heavy weight monitor to handle jni monitor exit |
|
399 |
void ObjectSynchronizer::jni_exit(oop obj, Thread* THREAD) { |
|
400 |
if (UseBiasedLocking) { |
|
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|
401 |
Handle h_obj(THREAD, obj); |
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|
402 |
BiasedLocking::revoke(h_obj, THREAD); |
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|
403 |
obj = h_obj(); |
6975 | 404 |
} |
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|
405 |
assert(!obj->mark().has_bias_pattern(), "biases should be revoked by now"); |
6975 | 406 |
|
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|
407 |
ObjectMonitor* monitor = inflate(THREAD, obj, inflate_cause_jni_exit); |
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|
408 |
// If this thread has locked the object, exit the monitor. We |
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|
409 |
// intentionally do not use CHECK here because we must exit the |
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|
410 |
// monitor even if an exception is pending. |
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|
411 |
if (monitor->check_owner(THREAD)) { |
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|
412 |
monitor->exit(true, THREAD); |
1 | 413 |
} |
6975 | 414 |
} |
415 |
||
416 |
// ----------------------------------------------------------------------------- |
|
417 |
// Internal VM locks on java objects |
|
418 |
// standard constructor, allows locking failures |
|
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|
419 |
ObjectLocker::ObjectLocker(Handle obj, Thread* thread, bool do_lock) { |
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|
420 |
_dolock = do_lock; |
6975 | 421 |
_thread = thread; |
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|
422 |
_thread->check_for_valid_safepoint_state(); |
6975 | 423 |
_obj = obj; |
1 | 424 |
|
6975 | 425 |
if (_dolock) { |
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|
426 |
ObjectSynchronizer::enter(_obj, &_lock, _thread); |
6975 | 427 |
} |
428 |
} |
|
429 |
||
430 |
ObjectLocker::~ObjectLocker() { |
|
431 |
if (_dolock) { |
|
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|
432 |
ObjectSynchronizer::exit(_obj(), &_lock, _thread); |
6975 | 433 |
} |
434 |
} |
|
1 | 435 |
|
436 |
||
6975 | 437 |
// ----------------------------------------------------------------------------- |
438 |
// Wait/Notify/NotifyAll |
|
439 |
// NOTE: must use heavy weight monitor to handle wait() |
|
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|
440 |
int ObjectSynchronizer::wait(Handle obj, jlong millis, TRAPS) { |
6975 | 441 |
if (UseBiasedLocking) { |
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|
442 |
BiasedLocking::revoke(obj, THREAD); |
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|
443 |
assert(!obj->mark().has_bias_pattern(), "biases should be revoked by now"); |
6975 | 444 |
} |
445 |
if (millis < 0) { |
|
22743
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changeset
|
446 |
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); |
6975 | 447 |
} |
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changeset
|
448 |
ObjectMonitor* monitor = inflate(THREAD, obj(), inflate_cause_wait); |
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|
449 |
|
6975 | 450 |
DTRACE_MONITOR_WAIT_PROBE(monitor, obj(), THREAD, millis); |
451 |
monitor->wait(millis, true, THREAD); |
|
452 |
||
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changeset
|
453 |
// This dummy call is in place to get around dtrace bug 6254741. Once |
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changeset
|
454 |
// that's fixed we can uncomment the following line, remove the call |
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changeset
|
455 |
// and change this function back into a "void" func. |
6975 | 456 |
// DTRACE_MONITOR_PROBE(waited, monitor, obj(), THREAD); |
22743
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changeset
|
457 |
return dtrace_waited_probe(monitor, obj, THREAD); |
6975 | 458 |
} |
1 | 459 |
|
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|
460 |
void ObjectSynchronizer::wait_uninterruptibly(Handle obj, jlong millis, TRAPS) { |
6975 | 461 |
if (UseBiasedLocking) { |
57893
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changeset
|
462 |
BiasedLocking::revoke(obj, THREAD); |
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changeset
|
463 |
assert(!obj->mark().has_bias_pattern(), "biases should be revoked by now"); |
6975 | 464 |
} |
465 |
if (millis < 0) { |
|
466 |
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); |
|
467 |
} |
|
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changeset
|
468 |
inflate(THREAD, obj(), inflate_cause_wait)->wait(millis, false, THREAD); |
6975 | 469 |
} |
470 |
||
471 |
void ObjectSynchronizer::notify(Handle obj, TRAPS) { |
|
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|
472 |
if (UseBiasedLocking) { |
57893
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changeset
|
473 |
BiasedLocking::revoke(obj, THREAD); |
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|
474 |
assert(!obj->mark().has_bias_pattern(), "biases should be revoked by now"); |
6975 | 475 |
} |
1 | 476 |
|
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changeset
|
477 |
markWord mark = obj->mark(); |
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changeset
|
478 |
if (mark.has_locker() && THREAD->is_lock_owned((address)mark.locker())) { |
6975 | 479 |
return; |
480 |
} |
|
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changeset
|
481 |
inflate(THREAD, obj(), inflate_cause_notify)->notify(THREAD); |
6975 | 482 |
} |
1 | 483 |
|
6975 | 484 |
// NOTE: see comment of notify() |
485 |
void ObjectSynchronizer::notifyall(Handle obj, TRAPS) { |
|
486 |
if (UseBiasedLocking) { |
|
57893
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diff
changeset
|
487 |
BiasedLocking::revoke(obj, THREAD); |
57777
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changeset
|
488 |
assert(!obj->mark().has_bias_pattern(), "biases should be revoked by now"); |
6975 | 489 |
} |
490 |
||
57777
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changeset
|
491 |
markWord mark = obj->mark(); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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diff
changeset
|
492 |
if (mark.has_locker() && THREAD->is_lock_owned((address)mark.locker())) { |
6975 | 493 |
return; |
494 |
} |
|
53557
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changeset
|
495 |
inflate(THREAD, obj(), inflate_cause_notify)->notifyAll(THREAD); |
6975 | 496 |
} |
497 |
||
498 |
// ----------------------------------------------------------------------------- |
|
499 |
// Hash Code handling |
|
500 |
// |
|
1 | 501 |
// Performance concern: |
25633
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changeset
|
502 |
// OrderAccess::storestore() calls release() which at one time stored 0 |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
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changeset
|
503 |
// into the global volatile OrderAccess::dummy variable. This store was |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
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changeset
|
504 |
// unnecessary for correctness. Many threads storing into a common location |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
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25477
diff
changeset
|
505 |
// causes considerable cache migration or "sloshing" on large SMP systems. |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
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25477
diff
changeset
|
506 |
// As such, I avoided using OrderAccess::storestore(). In some cases |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
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25477
diff
changeset
|
507 |
// OrderAccess::fence() -- which incurs local latency on the executing |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
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25477
diff
changeset
|
508 |
// processor -- is a better choice as it scales on SMP systems. |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
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25477
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changeset
|
509 |
// |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
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25477
diff
changeset
|
510 |
// See http://blogs.oracle.com/dave/entry/biased_locking_in_hotspot for |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
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diff
changeset
|
511 |
// a discussion of coherency costs. Note that all our current reference |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
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25477
diff
changeset
|
512 |
// platforms provide strong ST-ST order, so the issue is moot on IA32, |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
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diff
changeset
|
513 |
// x64, and SPARC. |
1 | 514 |
// |
515 |
// As a general policy we use "volatile" to control compiler-based reordering |
|
25633
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changeset
|
516 |
// and explicit fences (barriers) to control for architectural reordering |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
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diff
changeset
|
517 |
// performed by the CPU(s) or platform. |
1 | 518 |
|
519 |
struct SharedGlobals { |
|
27165
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changeset
|
520 |
char _pad_prefix[DEFAULT_CACHE_LINE_SIZE]; |
26683
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diff
changeset
|
521 |
// These are highly shared mostly-read variables. |
27165
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changeset
|
522 |
// To avoid false-sharing they need to be the sole occupants of a cache line. |
57906
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changeset
|
523 |
volatile int stw_random; |
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8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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diff
changeset
|
524 |
volatile int stw_cycle; |
27165
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8049737: Contended Locking reorder and cache line bucket
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parents:
26684
diff
changeset
|
525 |
DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile int) * 2); |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
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parents:
26684
diff
changeset
|
526 |
// Hot RW variable -- Sequester to avoid false-sharing |
57906
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57893
diff
changeset
|
527 |
volatile int hc_sequence; |
27165
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8049737: Contended Locking reorder and cache line bucket
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diff
changeset
|
528 |
DEFINE_PAD_MINUS_SIZE(2, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile int)); |
25064
244218e6ec0a
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diff
changeset
|
529 |
}; |
1 | 530 |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
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diff
changeset
|
531 |
static SharedGlobals GVars; |
59325 | 532 |
static int _forceMonitorScavenge = 0; // Scavenge required and pending |
1 | 533 |
|
57906
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57893
diff
changeset
|
534 |
static markWord read_stable_mark(oop obj) { |
57777
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8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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57734
diff
changeset
|
535 |
markWord mark = obj->mark(); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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diff
changeset
|
536 |
if (!mark.is_being_inflated()) { |
25064
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diff
changeset
|
537 |
return mark; // normal fast-path return |
6975 | 538 |
} |
1 | 539 |
|
25064
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diff
changeset
|
540 |
int its = 0; |
6975 | 541 |
for (;;) { |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
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diff
changeset
|
542 |
markWord mark = obj->mark(); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
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diff
changeset
|
543 |
if (!mark.is_being_inflated()) { |
25064
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8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
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diff
changeset
|
544 |
return mark; // normal fast-path return |
6975 | 545 |
} |
546 |
||
547 |
// The object is being inflated by some other thread. |
|
57906
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diff
changeset
|
548 |
// The caller of read_stable_mark() must wait for inflation to complete. |
6975 | 549 |
// Avoid live-lock |
550 |
// TODO: consider calling SafepointSynchronize::do_call_back() while |
|
551 |
// spinning to see if there's a safepoint pending. If so, immediately |
|
552 |
// yielding or blocking would be appropriate. Avoid spinning while |
|
553 |
// there is a safepoint pending. |
|
554 |
// TODO: add inflation contention performance counters. |
|
555 |
// TODO: restrict the aggregate number of spinners. |
|
1 | 556 |
|
25064
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diff
changeset
|
557 |
++its; |
6975 | 558 |
if (its > 10000 || !os::is_MP()) { |
26683
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diff
changeset
|
559 |
if (its & 1) { |
a02753d5a0b2
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diff
changeset
|
560 |
os::naked_yield(); |
a02753d5a0b2
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diff
changeset
|
561 |
} else { |
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8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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diff
changeset
|
562 |
// Note that the following code attenuates the livelock problem but is not |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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diff
changeset
|
563 |
// a complete remedy. A more complete solution would require that the inflating |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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diff
changeset
|
564 |
// thread hold the associated inflation lock. The following code simply restricts |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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diff
changeset
|
565 |
// the number of spinners to at most one. We'll have N-2 threads blocked |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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diff
changeset
|
566 |
// on the inflationlock, 1 thread holding the inflation lock and using |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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changeset
|
567 |
// a yield/park strategy, and 1 thread in the midst of inflation. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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changeset
|
568 |
// A more refined approach would be to change the encoding of INFLATING |
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|
569 |
// to allow encapsulation of a native thread pointer. Threads waiting for |
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|
570 |
// inflation to complete would use CAS to push themselves onto a singly linked |
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|
571 |
// list rooted at the markword. Once enqueued, they'd loop, checking a per-thread flag |
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|
572 |
// and calling park(). When inflation was complete the thread that accomplished inflation |
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|
573 |
// would detach the list and set the markword to inflated with a single CAS and |
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|
574 |
// then for each thread on the list, set the flag and unpark() the thread. |
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|
575 |
// This is conceptually similar to muxAcquire-muxRelease, except that muxRelease |
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|
576 |
// wakes at most one thread whereas we need to wake the entire list. |
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|
577 |
int ix = (cast_from_oop<intptr_t>(obj) >> 5) & (NINFLATIONLOCKS-1); |
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|
578 |
int YieldThenBlock = 0; |
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|
579 |
assert(ix >= 0 && ix < NINFLATIONLOCKS, "invariant"); |
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|
580 |
assert((NINFLATIONLOCKS & (NINFLATIONLOCKS-1)) == 0, "invariant"); |
30244 | 581 |
Thread::muxAcquire(gInflationLocks + ix, "gInflationLock"); |
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|
582 |
while (obj->mark() == markWord::INFLATING()) { |
26683
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|
583 |
// Beware: NakedYield() is advisory and has almost no effect on some platforms |
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|
584 |
// so we periodically call self->_ParkEvent->park(1). |
26683
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changeset
|
585 |
// We use a mixed spin/yield/block mechanism. |
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changeset
|
586 |
if ((YieldThenBlock++) >= 16) { |
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changeset
|
587 |
Thread::current()->_ParkEvent->park(1); |
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|
588 |
} else { |
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|
589 |
os::naked_yield(); |
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|
590 |
} |
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|
591 |
} |
30244 | 592 |
Thread::muxRelease(gInflationLocks + ix); |
26683
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|
593 |
} |
6975 | 594 |
} else { |
26683
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|
595 |
SpinPause(); // SMP-polite spinning |
6975 | 596 |
} |
597 |
} |
|
598 |
} |
|
1 | 599 |
|
600 |
// hashCode() generation : |
|
601 |
// |
|
602 |
// Possibilities: |
|
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|
603 |
// * MD5Digest of {obj,stw_random} |
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|
604 |
// * CRC32 of {obj,stw_random} or any linear-feedback shift register function. |
1 | 605 |
// * A DES- or AES-style SBox[] mechanism |
606 |
// * One of the Phi-based schemes, such as: |
|
607 |
// 2654435761 = 2^32 * Phi (golden ratio) |
|
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|
608 |
// HashCodeValue = ((uintptr_t(obj) >> 3) * 2654435761) ^ GVars.stw_random ; |
1 | 609 |
// * A variation of Marsaglia's shift-xor RNG scheme. |
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|
610 |
// * (obj ^ stw_random) is appealing, but can result |
1 | 611 |
// in undesirable regularity in the hashCode values of adjacent objects |
612 |
// (objects allocated back-to-back, in particular). This could potentially |
|
613 |
// result in hashtable collisions and reduced hashtable efficiency. |
|
614 |
// There are simple ways to "diffuse" the middle address bits over the |
|
615 |
// generated hashCode values: |
|
616 |
||
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|
617 |
static inline intptr_t get_next_hash(Thread* self, oop obj) { |
25064
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changeset
|
618 |
intptr_t value = 0; |
1 | 619 |
if (hashCode == 0) { |
46587
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changeset
|
620 |
// This form uses global Park-Miller RNG. |
26683
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changeset
|
621 |
// On MP system we'll have lots of RW access to a global, so the |
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changeset
|
622 |
// mechanism induces lots of coherency traffic. |
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changeset
|
623 |
value = os::random(); |
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changeset
|
624 |
} else if (hashCode == 1) { |
26683
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changeset
|
625 |
// This variation has the property of being stable (idempotent) |
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changeset
|
626 |
// between STW operations. This can be useful in some of the 1-0 |
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changeset
|
627 |
// synchronization schemes. |
57906
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changeset
|
628 |
intptr_t addr_bits = cast_from_oop<intptr_t>(obj) >> 3; |
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changeset
|
629 |
value = addr_bits ^ (addr_bits >> 5) ^ GVars.stw_random; |
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changeset
|
630 |
} else if (hashCode == 2) { |
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changeset
|
631 |
value = 1; // for sensitivity testing |
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changeset
|
632 |
} else if (hashCode == 3) { |
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|
633 |
value = ++GVars.hc_sequence; |
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|
634 |
} else if (hashCode == 4) { |
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|
635 |
value = cast_from_oop<intptr_t>(obj); |
1 | 636 |
} else { |
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changeset
|
637 |
// Marsaglia's xor-shift scheme with thread-specific state |
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changeset
|
638 |
// This is probably the best overall implementation -- we'll |
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|
639 |
// likely make this the default in future releases. |
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|
640 |
unsigned t = self->_hashStateX; |
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changeset
|
641 |
t ^= (t << 11); |
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changeset
|
642 |
self->_hashStateX = self->_hashStateY; |
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|
643 |
self->_hashStateY = self->_hashStateZ; |
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changeset
|
644 |
self->_hashStateZ = self->_hashStateW; |
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changeset
|
645 |
unsigned v = self->_hashStateW; |
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changeset
|
646 |
v = (v ^ (v >> 19)) ^ (t ^ (t >> 8)); |
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changeset
|
647 |
self->_hashStateW = v; |
26683
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changeset
|
648 |
value = v; |
1 | 649 |
} |
650 |
||
57777
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changeset
|
651 |
value &= markWord::hash_mask; |
25064
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changeset
|
652 |
if (value == 0) value = 0xBAD; |
57777
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changeset
|
653 |
assert(value != markWord::no_hash, "invariant"); |
1 | 654 |
return value; |
655 |
} |
|
26684
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changeset
|
656 |
|
57906
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changeset
|
657 |
intptr_t ObjectSynchronizer::FastHashCode(Thread* self, oop obj) { |
6975 | 658 |
if (UseBiasedLocking) { |
659 |
// NOTE: many places throughout the JVM do not expect a safepoint |
|
660 |
// to be taken here, in particular most operations on perm gen |
|
661 |
// objects. However, we only ever bias Java instances and all of |
|
662 |
// the call sites of identity_hash that might revoke biases have |
|
663 |
// been checked to make sure they can handle a safepoint. The |
|
664 |
// added check of the bias pattern is to avoid useless calls to |
|
665 |
// thread-local storage. |
|
57777
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changeset
|
666 |
if (obj->mark().has_bias_pattern()) { |
25472
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diff
changeset
|
667 |
// Handle for oop obj in case of STW safepoint |
57906
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changeset
|
668 |
Handle hobj(self, obj); |
6975 | 669 |
// Relaxing assertion for bug 6320749. |
25064
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changeset
|
670 |
assert(Universe::verify_in_progress() || |
26683
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changeset
|
671 |
!SafepointSynchronize::is_at_safepoint(), |
6975 | 672 |
"biases should not be seen by VM thread here"); |
57893
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diff
changeset
|
673 |
BiasedLocking::revoke(hobj, JavaThread::current()); |
25064
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changeset
|
674 |
obj = hobj(); |
57777
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changeset
|
675 |
assert(!obj->mark().has_bias_pattern(), "biases should be revoked by now"); |
6975 | 676 |
} |
677 |
} |
|
1 | 678 |
|
6975 | 679 |
// hashCode() is a heap mutator ... |
680 |
// Relaxing assertion for bug 6320749. |
|
31345
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changeset
|
681 |
assert(Universe::verify_in_progress() || DumpSharedSpaces || |
26683
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changeset
|
682 |
!SafepointSynchronize::is_at_safepoint(), "invariant"); |
31345
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changeset
|
683 |
assert(Universe::verify_in_progress() || DumpSharedSpaces || |
57906
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changeset
|
684 |
self->is_Java_thread() , "invariant"); |
31345
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changeset
|
685 |
assert(Universe::verify_in_progress() || DumpSharedSpaces || |
57906
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changeset
|
686 |
((JavaThread *)self)->thread_state() != _thread_blocked, "invariant"); |
6975 | 687 |
|
688 |
ObjectMonitor* monitor = NULL; |
|
57777
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changeset
|
689 |
markWord temp, test; |
6975 | 690 |
intptr_t hash; |
57906
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changeset
|
691 |
markWord mark = read_stable_mark(obj); |
6975 | 692 |
|
693 |
// object should remain ineligible for biased locking |
|
57777
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changeset
|
694 |
assert(!mark.has_bias_pattern(), "invariant"); |
6975 | 695 |
|
59225
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changeset
|
696 |
if (mark.is_neutral()) { // if this is a normal header |
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changeset
|
697 |
hash = mark.hash(); |
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changeset
|
698 |
if (hash != 0) { // if it has a hash, just return it |
6975 | 699 |
return hash; |
700 |
} |
|
59225
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changeset
|
701 |
hash = get_next_hash(self, obj); // get a new hash |
80e1201f6c9a
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changeset
|
702 |
temp = mark.copy_set_hash(hash); // merge the hash into header |
80e1201f6c9a
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changeset
|
703 |
// try to install the hash |
46678
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8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents:
46625
diff
changeset
|
704 |
test = obj->cas_set_mark(temp, mark); |
59225
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changeset
|
705 |
if (test == mark) { // if the hash was installed, return it |
6975 | 706 |
return hash; |
707 |
} |
|
59225
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changeset
|
708 |
// Failed to install the hash. It could be that another thread |
80e1201f6c9a
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changeset
|
709 |
// installed the hash just before our attempt or inflation has |
80e1201f6c9a
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changeset
|
710 |
// occurred or... so we fall thru to inflate the monitor for |
80e1201f6c9a
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changeset
|
711 |
// stability and then install the hash. |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
712 |
} else if (mark.has_monitor()) { |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
713 |
monitor = mark.monitor(); |
6975 | 714 |
temp = monitor->header(); |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
715 |
assert(temp.is_neutral(), "invariant: header=" INTPTR_FORMAT, temp.value()); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
716 |
hash = temp.hash(); |
59225
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
717 |
if (hash != 0) { // if it has a hash, just return it |
6975 | 718 |
return hash; |
719 |
} |
|
59225
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
720 |
// Fall thru so we only have one place that installs the hash in |
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
721 |
// the ObjectMonitor. |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
722 |
} else if (self->is_lock_owned((address)mark.locker())) { |
59225
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
723 |
// This is a stack lock owned by the calling thread so fetch the |
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
724 |
// displaced markWord from the BasicLock on the stack. |
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
725 |
temp = mark.displaced_mark_helper(); |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
726 |
assert(temp.is_neutral(), "invariant: header=" INTPTR_FORMAT, temp.value()); |
59225
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
727 |
hash = temp.hash(); |
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
728 |
if (hash != 0) { // if it has a hash, just return it |
6975 | 729 |
return hash; |
730 |
} |
|
731 |
// WARNING: |
|
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
732 |
// The displaced header in the BasicLock on a thread's stack |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
733 |
// is strictly immutable. It CANNOT be changed in ANY cases. |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
734 |
// So we have to inflate the stack lock into an ObjectMonitor |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
735 |
// even if the current thread owns the lock. The BasicLock on |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
736 |
// a thread's stack can be asynchronously read by other threads |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
737 |
// during an inflate() call so any change to that stack memory |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
738 |
// may not propagate to other threads correctly. |
6975 | 739 |
} |
740 |
||
59225
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
741 |
// Inflate the monitor to set the hash. |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
742 |
monitor = inflate(self, obj, inflate_cause_hash_code); |
59225
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
743 |
// Load ObjectMonitor's header/dmw field and see if it has a hash. |
6975 | 744 |
mark = monitor->header(); |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
745 |
assert(mark.is_neutral(), "invariant: header=" INTPTR_FORMAT, mark.value()); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
746 |
hash = mark.hash(); |
59225
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
747 |
if (hash == 0) { // if it does not have a hash |
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
748 |
hash = get_next_hash(self, obj); // get a new hash |
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
749 |
temp = mark.copy_set_hash(hash); // merge the hash into header |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
750 |
assert(temp.is_neutral(), "invariant: header=" INTPTR_FORMAT, temp.value()); |
59252
623722a6aeb9
8234740: Harmonize parameter order in Atomic - cmpxchg
stefank
parents:
59251
diff
changeset
|
751 |
uintptr_t v = Atomic::cmpxchg((volatile uintptr_t*)monitor->header_addr(), mark.value(), temp.value()); |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
752 |
test = markWord(v); |
6975 | 753 |
if (test != mark) { |
59225
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
754 |
// The attempt to update the ObjectMonitor's header/dmw field |
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
755 |
// did not work. This can happen if another thread managed to |
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
756 |
// merge in the hash just before our cmpxchg(). |
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
757 |
// If we add any new usages of the header/dmw field, this code |
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
758 |
// will need to be updated. |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
759 |
hash = test.hash(); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
760 |
assert(test.is_neutral(), "invariant: header=" INTPTR_FORMAT, test.value()); |
59225
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
761 |
assert(hash != 0, "should only have lost the race to a thread that set a non-zero hash"); |
6975 | 762 |
} |
763 |
} |
|
59225
80e1201f6c9a
8234544: ObjectSynchronizer::FastHashCode() cleanups from Async Monitor Deflation project
dcubed
parents:
59156
diff
changeset
|
764 |
// We finally get the hash. |
6975 | 765 |
return hash; |
1 | 766 |
} |
767 |
||
6975 | 768 |
// Deprecated -- use FastHashCode() instead. |
1 | 769 |
|
6975 | 770 |
intptr_t ObjectSynchronizer::identity_hash_value_for(Handle obj) { |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
771 |
return FastHashCode(Thread::current(), obj()); |
1 | 772 |
} |
773 |
||
774 |
||
6975 | 775 |
bool ObjectSynchronizer::current_thread_holds_lock(JavaThread* thread, |
776 |
Handle h_obj) { |
|
777 |
if (UseBiasedLocking) { |
|
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
778 |
BiasedLocking::revoke(h_obj, thread); |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
779 |
assert(!h_obj->mark().has_bias_pattern(), "biases should be revoked by now"); |
6975 | 780 |
} |
781 |
||
782 |
assert(thread == JavaThread::current(), "Can only be called on current thread"); |
|
783 |
oop obj = h_obj(); |
|
784 |
||
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
785 |
markWord mark = read_stable_mark(obj); |
1 | 786 |
|
6975 | 787 |
// Uncontended case, header points to stack |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
788 |
if (mark.has_locker()) { |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
789 |
return thread->is_lock_owned((address)mark.locker()); |
1 | 790 |
} |
6975 | 791 |
// Contended case, header points to ObjectMonitor (tagged pointer) |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
792 |
if (mark.has_monitor()) { |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
793 |
ObjectMonitor* monitor = mark.monitor(); |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
794 |
return monitor->is_entered(thread) != 0; |
1 | 795 |
} |
6975 | 796 |
// Unlocked case, header in place |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
797 |
assert(mark.is_neutral(), "sanity check"); |
6975 | 798 |
return false; |
1 | 799 |
} |
800 |
||
6975 | 801 |
// Be aware of this method could revoke bias of the lock object. |
22551 | 802 |
// This method queries the ownership of the lock handle specified by 'h_obj'. |
6975 | 803 |
// If the current thread owns the lock, it returns owner_self. If no |
804 |
// thread owns the lock, it returns owner_none. Otherwise, it will return |
|
22551 | 805 |
// owner_other. |
6975 | 806 |
ObjectSynchronizer::LockOwnership ObjectSynchronizer::query_lock_ownership |
807 |
(JavaThread *self, Handle h_obj) { |
|
808 |
// The caller must beware this method can revoke bias, and |
|
809 |
// revocation can result in a safepoint. |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
810 |
assert(!SafepointSynchronize::is_at_safepoint(), "invariant"); |
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
811 |
assert(self->thread_state() != _thread_blocked, "invariant"); |
1 | 812 |
|
6975 | 813 |
// Possible mark states: neutral, biased, stack-locked, inflated |
814 |
||
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
815 |
if (UseBiasedLocking && h_obj()->mark().has_bias_pattern()) { |
6975 | 816 |
// CASE: biased |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
817 |
BiasedLocking::revoke(h_obj, self); |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
818 |
assert(!h_obj->mark().has_bias_pattern(), |
6975 | 819 |
"biases should be revoked by now"); |
820 |
} |
|
1 | 821 |
|
6975 | 822 |
assert(self == JavaThread::current(), "Can only be called on current thread"); |
823 |
oop obj = h_obj(); |
|
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
824 |
markWord mark = read_stable_mark(obj); |
6975 | 825 |
|
826 |
// CASE: stack-locked. Mark points to a BasicLock on the owner's stack. |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
827 |
if (mark.has_locker()) { |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
828 |
return self->is_lock_owned((address)mark.locker()) ? |
6975 | 829 |
owner_self : owner_other; |
830 |
} |
|
1 | 831 |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
832 |
// CASE: inflated. Mark (tagged pointer) points to an ObjectMonitor. |
6975 | 833 |
// The Object:ObjectMonitor relationship is stable as long as we're |
834 |
// not at a safepoint. |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
835 |
if (mark.has_monitor()) { |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
836 |
void* owner = mark.monitor()->_owner; |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
837 |
if (owner == NULL) return owner_none; |
6975 | 838 |
return (owner == self || |
839 |
self->is_lock_owned((address)owner)) ? owner_self : owner_other; |
|
840 |
} |
|
841 |
||
842 |
// CASE: neutral |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
843 |
assert(mark.is_neutral(), "sanity check"); |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
844 |
return owner_none; // it's unlocked |
6975 | 845 |
} |
1 | 846 |
|
6975 | 847 |
// FIXME: jvmti should call this |
48105
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
47634
diff
changeset
|
848 |
JavaThread* ObjectSynchronizer::get_lock_owner(ThreadsList * t_list, Handle h_obj) { |
6975 | 849 |
if (UseBiasedLocking) { |
850 |
if (SafepointSynchronize::is_at_safepoint()) { |
|
851 |
BiasedLocking::revoke_at_safepoint(h_obj); |
|
852 |
} else { |
|
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
853 |
BiasedLocking::revoke(h_obj, JavaThread::current()); |
6975 | 854 |
} |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
855 |
assert(!h_obj->mark().has_bias_pattern(), "biases should be revoked by now"); |
6975 | 856 |
} |
857 |
||
858 |
oop obj = h_obj(); |
|
859 |
address owner = NULL; |
|
860 |
||
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
861 |
markWord mark = read_stable_mark(obj); |
6975 | 862 |
|
863 |
// Uncontended case, header points to stack |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
864 |
if (mark.has_locker()) { |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
865 |
owner = (address) mark.locker(); |
6975 | 866 |
} |
867 |
||
868 |
// Contended case, header points to ObjectMonitor (tagged pointer) |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
869 |
else if (mark.has_monitor()) { |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
870 |
ObjectMonitor* monitor = mark.monitor(); |
6975 | 871 |
assert(monitor != NULL, "monitor should be non-null"); |
872 |
owner = (address) monitor->owner(); |
|
873 |
} |
|
874 |
||
875 |
if (owner != NULL) { |
|
15853
1c4e16950e96
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
15475
diff
changeset
|
876 |
// owning_thread_from_monitor_owner() may also return NULL here |
48105
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
47634
diff
changeset
|
877 |
return Threads::owning_thread_from_monitor_owner(t_list, owner); |
6975 | 878 |
} |
879 |
||
880 |
// Unlocked case, header in place |
|
881 |
// Cannot have assertion since this object may have been |
|
882 |
// locked by another thread when reaching here. |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
883 |
// assert(mark.is_neutral(), "sanity check"); |
6975 | 884 |
|
885 |
return NULL; |
|
886 |
} |
|
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
887 |
|
6975 | 888 |
// Visitors ... |
889 |
||
890 |
void ObjectSynchronizer::monitors_iterate(MonitorClosure* closure) { |
|
59247
56bf71d64d51
8234562: Move OrderAccess::release_store*/load_acquire to Atomic
stefank
parents:
59225
diff
changeset
|
891 |
PaddedObjectMonitor* block = Atomic::load_acquire(&g_block_list); |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
892 |
while (block != NULL) { |
6975 | 893 |
assert(block->object() == CHAINMARKER, "must be a block header"); |
894 |
for (int i = _BLOCKSIZE - 1; i > 0; i--) { |
|
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
895 |
ObjectMonitor* mid = (ObjectMonitor *)(block + i); |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
896 |
oop object = (oop)mid->object(); |
6975 | 897 |
if (object != NULL) { |
57906
e17f768b3b71
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|
898 |
// Only process with closure if the object is set. |
6975 | 899 |
closure->do_monitor(mid); |
900 |
} |
|
901 |
} |
|
57906
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|
902 |
block = (PaddedObjectMonitor*)block->_next_om; |
1 | 903 |
} |
904 |
} |
|
905 |
||
46541
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|
906 |
static bool monitors_used_above_threshold() { |
57906
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|
907 |
if (g_om_population == 0) { |
46541
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diff
changeset
|
908 |
return false; |
d20828de9e39
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diff
changeset
|
909 |
} |
57906
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|
910 |
int monitors_used = g_om_population - g_om_free_count; |
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|
911 |
int monitor_usage = (monitors_used * 100LL) / g_om_population; |
46541
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|
912 |
return monitor_usage > MonitorUsedDeflationThreshold; |
d20828de9e39
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changeset
|
913 |
} |
d20828de9e39
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changeset
|
914 |
|
d20828de9e39
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changeset
|
915 |
bool ObjectSynchronizer::is_cleanup_needed() { |
d20828de9e39
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changeset
|
916 |
if (MonitorUsedDeflationThreshold > 0) { |
59325 | 917 |
if (monitors_used_above_threshold()) { |
918 |
return true; |
|
919 |
} |
|
920 |
} |
|
921 |
return needs_monitor_scavenge(); |
|
922 |
} |
|
923 |
||
924 |
bool ObjectSynchronizer::needs_monitor_scavenge() { |
|
925 |
if (Atomic::load(&_forceMonitorScavenge) == 1) { |
|
926 |
log_info(monitorinflation)("Monitor scavenge needed, triggering safepoint cleanup."); |
|
927 |
return true; |
|
46541
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changeset
|
928 |
} |
d20828de9e39
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changeset
|
929 |
return false; |
d20828de9e39
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changeset
|
930 |
} |
1 | 931 |
|
6975 | 932 |
void ObjectSynchronizer::oops_do(OopClosure* f) { |
51998
27b48d82272c
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changeset
|
933 |
// We only scan the global used list here (for moribund threads), and |
27b48d82272c
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changeset
|
934 |
// the thread-local monitors in Thread::oops_do(). |
27b48d82272c
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changeset
|
935 |
global_used_oops_do(f); |
1 | 936 |
} |
937 |
||
46474
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|
938 |
void ObjectSynchronizer::global_used_oops_do(OopClosure* f) { |
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|
939 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
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|
940 |
list_oops_do(g_om_in_use_list, f); |
46474
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|
941 |
} |
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changeset
|
942 |
|
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changeset
|
943 |
void ObjectSynchronizer::thread_local_used_oops_do(Thread* thread, OopClosure* f) { |
c872a196b75f
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|
944 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
57906
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|
945 |
list_oops_do(thread->om_in_use_list, f); |
46474
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|
946 |
} |
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changeset
|
947 |
|
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changeset
|
948 |
void ObjectSynchronizer::list_oops_do(ObjectMonitor* list, OopClosure* f) { |
c872a196b75f
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changeset
|
949 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
c872a196b75f
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changeset
|
950 |
ObjectMonitor* mid; |
57906
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|
951 |
for (mid = list; mid != NULL; mid = mid->_next_om) { |
46474
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changeset
|
952 |
if (mid->object() != NULL) { |
c872a196b75f
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changeset
|
953 |
f->do_oop((oop*)mid->object_addr()); |
c872a196b75f
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diff
changeset
|
954 |
} |
c872a196b75f
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diff
changeset
|
955 |
} |
c872a196b75f
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diff
changeset
|
956 |
} |
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changeset
|
957 |
|
1 | 958 |
|
6975 | 959 |
// ----------------------------------------------------------------------------- |
1 | 960 |
// ObjectMonitor Lifecycle |
961 |
// ----------------------- |
|
57906
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|
962 |
// Inflation unlinks monitors from the global g_free_list and |
1 | 963 |
// associates them with objects. Deflation -- which occurs at |
964 |
// STW-time -- disassociates idle monitors from objects. Such |
|
57906
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|
965 |
// scavenged monitors are returned to the g_free_list. |
1 | 966 |
// |
30244 | 967 |
// The global list is protected by gListLock. All the critical sections |
1 | 968 |
// are short and operate in constant-time. |
969 |
// |
|
970 |
// ObjectMonitors reside in type-stable memory (TSM) and are immortal. |
|
971 |
// |
|
972 |
// Lifecycle: |
|
973 |
// -- unassigned and on the global free list |
|
57906
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|
974 |
// -- unassigned and on a thread's private om_free_list |
1 | 975 |
// -- assigned to an object. The object is inflated and the mark refers |
976 |
// to the objectmonitor. |
|
977 |
||
978 |
||
5710 | 979 |
// Constraining monitor pool growth via MonitorBound ... |
980 |
// |
|
57906
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|
981 |
// If MonitorBound is not set (<= 0), MonitorBound checks are disabled. |
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|
982 |
// |
5710 | 983 |
// The monitor pool is grow-only. We scavenge at STW safepoint-time, but the |
984 |
// the rate of scavenging is driven primarily by GC. As such, we can find |
|
985 |
// an inordinate number of monitors in circulation. |
|
986 |
// To avoid that scenario we can artificially induce a STW safepoint |
|
987 |
// if the pool appears to be growing past some reasonable bound. |
|
988 |
// Generally we favor time in space-time tradeoffs, but as there's no |
|
989 |
// natural back-pressure on the # of extant monitors we need to impose some |
|
990 |
// type of limit. Beware that if MonitorBound is set to too low a value |
|
991 |
// we could just loop. In addition, if MonitorBound is set to a low value |
|
992 |
// we'll incur more safepoints, which are harmful to performance. |
|
993 |
// See also: GuaranteedSafepointInterval |
|
994 |
// |
|
57906
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changeset
|
995 |
// If MonitorBound is set, the boundry applies to |
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|
996 |
// (g_om_population - g_om_free_count) |
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|
997 |
// i.e., if there are not enough ObjectMonitors on the global free list, |
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|
998 |
// then a safepoint deflation is induced. Picking a good MonitorBound value |
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|
999 |
// is non-trivial. |
5710 | 1000 |
|
57906
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changeset
|
1001 |
static void InduceScavenge(Thread* self, const char * Whence) { |
5710 | 1002 |
// Induce STW safepoint to trim monitors |
1003 |
// Ultimately, this results in a call to deflate_idle_monitors() in the near future. |
|
59325 | 1004 |
// More precisely, trigger a cleanup safepoint as the number |
5710 | 1005 |
// of active monitors passes the specified threshold. |
1006 |
// TODO: assert thread state is reasonable |
|
1007 |
||
59325 | 1008 |
if (Atomic::xchg (&_forceMonitorScavenge, 1) == 0) { |
1009 |
VMThread::check_for_forced_cleanup(); |
|
5710 | 1010 |
} |
1011 |
} |
|
25472
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8047104: cleanup misc issues prior to Contended Locking reorder and cache
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25468
diff
changeset
|
1012 |
|
57906
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|
1013 |
ObjectMonitor* ObjectSynchronizer::om_alloc(Thread* self) { |
26683
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8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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changeset
|
1014 |
// A large MAXPRIVATE value reduces both list lock contention |
a02753d5a0b2
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changeset
|
1015 |
// and list coherency traffic, but also tends to increase the |
57906
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changeset
|
1016 |
// number of ObjectMonitors in circulation as well as the STW |
26683
a02753d5a0b2
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changeset
|
1017 |
// scavenge costs. As usual, we lean toward time in space-time |
a02753d5a0b2
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changeset
|
1018 |
// tradeoffs. |
a02753d5a0b2
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changeset
|
1019 |
const int MAXPRIVATE = 1024; |
55345
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
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54786
diff
changeset
|
1020 |
stringStream ss; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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diff
changeset
|
1021 |
for (;;) { |
57906
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changeset
|
1022 |
ObjectMonitor* m; |
1 | 1023 |
|
57906
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changeset
|
1024 |
// 1: try to allocate from the thread's local om_free_list. |
26683
a02753d5a0b2
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changeset
|
1025 |
// Threads will attempt to allocate first from their local list, then |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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diff
changeset
|
1026 |
// from the global list, and only after those attempts fail will the thread |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
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changeset
|
1027 |
// attempt to instantiate new monitors. Thread-local free lists take |
30244 | 1028 |
// heat off the gListLock and improve allocation latency, as well as reducing |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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changeset
|
1029 |
// coherency traffic on the shared global list. |
57906
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changeset
|
1030 |
m = self->om_free_list; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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changeset
|
1031 |
if (m != NULL) { |
57906
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changeset
|
1032 |
self->om_free_list = m->_next_om; |
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changeset
|
1033 |
self->om_free_count--; |
26683
a02753d5a0b2
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changeset
|
1034 |
guarantee(m->object() == NULL, "invariant"); |
57906
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changeset
|
1035 |
m->_next_om = self->om_in_use_list; |
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changeset
|
1036 |
self->om_in_use_list = m; |
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changeset
|
1037 |
self->om_in_use_count++; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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changeset
|
1038 |
return m; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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changeset
|
1039 |
} |
1 | 1040 |
|
57906
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changeset
|
1041 |
// 2: try to allocate from the global g_free_list |
26683
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changeset
|
1042 |
// CONSIDER: use muxTry() instead of muxAcquire(). |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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changeset
|
1043 |
// If the muxTry() fails then drop immediately into case 3. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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changeset
|
1044 |
// If we're using thread-local free lists then try |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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changeset
|
1045 |
// to reprovision the caller's free list. |
57906
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changeset
|
1046 |
if (g_free_list != NULL) { |
e17f768b3b71
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changeset
|
1047 |
// Reprovision the thread's om_free_list. |
26683
a02753d5a0b2
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changeset
|
1048 |
// Use bulk transfers to reduce the allocation rate and heat |
a02753d5a0b2
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changeset
|
1049 |
// on various locks. |
57906
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changeset
|
1050 |
Thread::muxAcquire(&gListLock, "om_alloc(1)"); |
e17f768b3b71
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changeset
|
1051 |
for (int i = self->om_free_provision; --i >= 0 && g_free_list != NULL;) { |
e17f768b3b71
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changeset
|
1052 |
g_om_free_count--; |
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changeset
|
1053 |
ObjectMonitor* take = g_free_list; |
e17f768b3b71
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changeset
|
1054 |
g_free_list = take->_next_om; |
26683
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changeset
|
1055 |
guarantee(take->object() == NULL, "invariant"); |
a02753d5a0b2
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changeset
|
1056 |
take->Recycle(); |
57906
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changeset
|
1057 |
om_release(self, take, false); |
26683
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|
1058 |
} |
30244 | 1059 |
Thread::muxRelease(&gListLock); |
57906
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|
1060 |
self->om_free_provision += 1 + (self->om_free_provision/2); |
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changeset
|
1061 |
if (self->om_free_provision > MAXPRIVATE) self->om_free_provision = MAXPRIVATE; |
5710 | 1062 |
|
26683
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changeset
|
1063 |
const int mx = MonitorBound; |
57906
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changeset
|
1064 |
if (mx > 0 && (g_om_population-g_om_free_count) > mx) { |
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changeset
|
1065 |
// Not enough ObjectMonitors on the global free list. |
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changeset
|
1066 |
// We can't safely induce a STW safepoint from om_alloc() as our thread |
26683
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changeset
|
1067 |
// state may not be appropriate for such activities and callers may hold |
a02753d5a0b2
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changeset
|
1068 |
// naked oops, so instead we defer the action. |
57906
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|
1069 |
InduceScavenge(self, "om_alloc"); |
26683
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|
1070 |
} |
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changeset
|
1071 |
continue; |
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|
1072 |
} |
1 | 1073 |
|
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changeset
|
1074 |
// 3: allocate a block of new ObjectMonitors |
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changeset
|
1075 |
// Both the local and global free lists are empty -- resort to malloc(). |
57906
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changeset
|
1076 |
// In the current implementation ObjectMonitors are TSM - immortal. |
27165
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changeset
|
1077 |
// Ideally, we'd write "new ObjectMonitor[_BLOCKSIZE], but we want |
785a8d56024c
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changeset
|
1078 |
// each ObjectMonitor to start at the beginning of a cache line, |
46619
a3919f5e8d2b
8178499: Remove _ptr_ and _size_ infixes from align functions
stefank
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46618
diff
changeset
|
1079 |
// so we use align_up(). |
27165
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changeset
|
1080 |
// A better solution would be to use C++ placement-new. |
785a8d56024c
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changeset
|
1081 |
// BEWARE: As it stands currently, we don't run the ctors! |
26683
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changeset
|
1082 |
assert(_BLOCKSIZE > 1, "invariant"); |
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changeset
|
1083 |
size_t neededsize = sizeof(PaddedObjectMonitor) * _BLOCKSIZE; |
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changeset
|
1084 |
PaddedObjectMonitor* temp; |
27165
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changeset
|
1085 |
size_t aligned_size = neededsize + (DEFAULT_CACHE_LINE_SIZE - 1); |
58083 | 1086 |
void* real_malloc_addr = NEW_C_HEAP_ARRAY(char, aligned_size, mtInternal); |
57906
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changeset
|
1087 |
temp = (PaddedObjectMonitor*)align_up(real_malloc_addr, DEFAULT_CACHE_LINE_SIZE); |
27165
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changeset
|
1088 |
(void)memset((void *) temp, 0, neededsize); |
1 | 1089 |
|
26683
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changeset
|
1090 |
// Format the block. |
a02753d5a0b2
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changeset
|
1091 |
// initialize the linked list, each monitor points to its next |
a02753d5a0b2
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changeset
|
1092 |
// forming the single linked free list, the very first monitor |
a02753d5a0b2
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changeset
|
1093 |
// will points to next block, which forms the block list. |
57906
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changeset
|
1094 |
// The trick of using the 1st element in the block as g_block_list |
26683
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changeset
|
1095 |
// linkage should be reconsidered. A better implementation would |
a02753d5a0b2
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changeset
|
1096 |
// look like: class Block { Block * next; int N; ObjectMonitor Body [N] ; } |
1 | 1097 |
|
26683
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changeset
|
1098 |
for (int i = 1; i < _BLOCKSIZE; i++) { |
57906
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changeset
|
1099 |
temp[i]._next_om = (ObjectMonitor *)&temp[i+1]; |
26683
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changeset
|
1100 |
} |
1 | 1101 |
|
26683
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changeset
|
1102 |
// terminate the last monitor as the end of list |
57906
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changeset
|
1103 |
temp[_BLOCKSIZE - 1]._next_om = NULL; |
1 | 1104 |
|
26683
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changeset
|
1105 |
// Element [0] is reserved for global list linkage |
a02753d5a0b2
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changeset
|
1106 |
temp[0].set_object(CHAINMARKER); |
1 | 1107 |
|
26683
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changeset
|
1108 |
// Consider carving out this thread's current request from the |
a02753d5a0b2
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changeset
|
1109 |
// block in hand. This avoids some lock traffic and redundant |
a02753d5a0b2
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changeset
|
1110 |
// list activity. |
1 | 1111 |
|
57906
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changeset
|
1112 |
// Acquire the gListLock to manipulate g_block_list and g_free_list. |
26683
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changeset
|
1113 |
// An Oyama-Taura-Yonezawa scheme might be more efficient. |
57906
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changeset
|
1114 |
Thread::muxAcquire(&gListLock, "om_alloc(2)"); |
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changeset
|
1115 |
g_om_population += _BLOCKSIZE-1; |
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changeset
|
1116 |
g_om_free_count += _BLOCKSIZE-1; |
1 | 1117 |
|
57906
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changeset
|
1118 |
// Add the new block to the list of extant blocks (g_block_list). |
e17f768b3b71
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changeset
|
1119 |
// The very first ObjectMonitor in a block is reserved and dedicated. |
26683
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changeset
|
1120 |
// It serves as blocklist "next" linkage. |
57906
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changeset
|
1121 |
temp[0]._next_om = g_block_list; |
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changeset
|
1122 |
// There are lock-free uses of g_block_list so make sure that |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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changeset
|
1123 |
// the previous stores happen before we update g_block_list. |
59247
56bf71d64d51
8234562: Move OrderAccess::release_store*/load_acquire to Atomic
stefank
parents:
59225
diff
changeset
|
1124 |
Atomic::release_store(&g_block_list, temp); |
1 | 1125 |
|
57906
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changeset
|
1126 |
// Add the new string of ObjectMonitors to the global free list |
e17f768b3b71
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changeset
|
1127 |
temp[_BLOCKSIZE - 1]._next_om = g_free_list; |
e17f768b3b71
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changeset
|
1128 |
g_free_list = temp + 1; |
30244 | 1129 |
Thread::muxRelease(&gListLock); |
26683
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changeset
|
1130 |
} |
1 | 1131 |
} |
1132 |
||
57906
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changeset
|
1133 |
// Place "m" on the caller's private per-thread om_free_list. |
1 | 1134 |
// In practice there's no need to clamp or limit the number of |
57906
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changeset
|
1135 |
// monitors on a thread's om_free_list as the only non-allocation time |
e17f768b3b71
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dcubed
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57893
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changeset
|
1136 |
// we'll call om_release() is to return a monitor to the free list after |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
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diff
changeset
|
1137 |
// a CAS attempt failed. This doesn't allow unbounded #s of monitors to |
1 | 1138 |
// accumulate on a thread's free list. |
30244 | 1139 |
// |
1140 |
// Key constraint: all ObjectMonitors on a thread's free list and the global |
|
1141 |
// free list must have their object field set to null. This prevents the |
|
57906
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changeset
|
1142 |
// scavenger -- deflate_monitor_list() -- from reclaiming them while we |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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changeset
|
1143 |
// are trying to release them. |
1 | 1144 |
|
57906
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changeset
|
1145 |
void ObjectSynchronizer::om_release(Thread* self, ObjectMonitor* m, |
e17f768b3b71
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changeset
|
1146 |
bool from_per_thread_alloc) { |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1147 |
guarantee(m->header().value() == 0, "invariant"); |
26683
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changeset
|
1148 |
guarantee(m->object() == NULL, "invariant"); |
55345
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
1149 |
stringStream ss; |
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
1150 |
guarantee((m->is_busy() | m->_recursions) == 0, "freeing in-use monitor: " |
59156
14fa9e70ae71
8230876: baseline cleanups from Async Monitor Deflation v2.0[789]
dcubed
parents:
58291
diff
changeset
|
1151 |
"%s, recursions=" INTX_FORMAT, m->is_busy_to_string(&ss), |
55345
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
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54786
diff
changeset
|
1152 |
m->_recursions); |
57906
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changeset
|
1153 |
// _next_om is used for both per-thread in-use and free lists so |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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changeset
|
1154 |
// we have to remove 'm' from the in-use list first (as needed). |
e17f768b3b71
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changeset
|
1155 |
if (from_per_thread_alloc) { |
e17f768b3b71
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diff
changeset
|
1156 |
// Need to remove 'm' from om_in_use_list. |
30244 | 1157 |
ObjectMonitor* cur_mid_in_use = NULL; |
1158 |
bool extracted = false; |
|
57906
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changeset
|
1159 |
for (ObjectMonitor* mid = self->om_in_use_list; mid != NULL; cur_mid_in_use = mid, mid = mid->_next_om) { |
26683
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changeset
|
1160 |
if (m == mid) { |
30244 | 1161 |
// extract from per-thread in-use list |
57906
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changeset
|
1162 |
if (mid == self->om_in_use_list) { |
e17f768b3b71
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changeset
|
1163 |
self->om_in_use_list = mid->_next_om; |
30244 | 1164 |
} else if (cur_mid_in_use != NULL) { |
57906
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changeset
|
1165 |
cur_mid_in_use->_next_om = mid->_next_om; // maintain the current thread in-use list |
26683
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changeset
|
1166 |
} |
30244 | 1167 |
extracted = true; |
57906
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changeset
|
1168 |
self->om_in_use_count--; |
26683
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changeset
|
1169 |
break; |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1170 |
} |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1171 |
} |
30244 | 1172 |
assert(extracted, "Should have extracted from in-use list"); |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1173 |
} |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1174 |
|
57906
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changeset
|
1175 |
m->_next_om = self->om_free_list; |
e17f768b3b71
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changeset
|
1176 |
self->om_free_list = m; |
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changeset
|
1177 |
self->om_free_count++; |
1 | 1178 |
} |
1179 |
||
57906
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diff
changeset
|
1180 |
// Return ObjectMonitors on a moribund thread's free and in-use |
e17f768b3b71
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changeset
|
1181 |
// lists to the appropriate global lists. The ObjectMonitors on the |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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changeset
|
1182 |
// per-thread in-use list may still be in use by other threads. |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1183 |
// |
57906
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changeset
|
1184 |
// We currently call om_flush() from Threads::remove() before the |
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|
1185 |
// thread has been excised from the thread list and is no longer a |
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|
1186 |
// mutator. This means that om_flush() cannot run concurrently with |
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|
1187 |
// a safepoint and interleave with deflate_idle_monitors(). In |
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|
1188 |
// particular, this ensures that the thread's in-use monitors are |
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|
1189 |
// scanned by a GC safepoint, either via Thread::oops_do() (before |
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|
1190 |
// om_flush() is called) or via ObjectSynchronizer::oops_do() (after |
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|
1191 |
// om_flush() is called). |
1 | 1192 |
|
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|
1193 |
void ObjectSynchronizer::om_flush(Thread* self) { |
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|
1194 |
ObjectMonitor* free_list = self->om_free_list; |
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|
1195 |
ObjectMonitor* free_tail = NULL; |
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|
1196 |
int free_count = 0; |
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|
1197 |
if (free_list != NULL) { |
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|
1198 |
ObjectMonitor* s; |
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|
1199 |
// The thread is going away. Set 'free_tail' to the last per-thread free |
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|
1200 |
// monitor which will be linked to g_free_list below under the gListLock. |
55345
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changeset
|
1201 |
stringStream ss; |
57906
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|
1202 |
for (s = free_list; s != NULL; s = s->_next_om) { |
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|
1203 |
free_count++; |
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|
1204 |
free_tail = s; |
26683
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|
1205 |
guarantee(s->object() == NULL, "invariant"); |
55345
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changeset
|
1206 |
guarantee(!s->is_busy(), "must be !is_busy: %s", s->is_busy_to_string(&ss)); |
1 | 1207 |
} |
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|
1208 |
guarantee(free_tail != NULL, "invariant"); |
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|
1209 |
assert(self->om_free_count == free_count, "free-count off"); |
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|
1210 |
self->om_free_list = NULL; |
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|
1211 |
self->om_free_count = 0; |
26683
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|
1212 |
} |
1 | 1213 |
|
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|
1214 |
ObjectMonitor* in_use_list = self->om_in_use_list; |
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|
1215 |
ObjectMonitor* in_use_tail = NULL; |
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|
1216 |
int in_use_count = 0; |
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changeset
|
1217 |
if (in_use_list != NULL) { |
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changeset
|
1218 |
// The thread is going away, however the ObjectMonitors on the |
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|
1219 |
// om_in_use_list may still be in-use by other threads. Link |
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|
1220 |
// them to in_use_tail, which will be linked into the global |
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|
1221 |
// in-use list g_om_in_use_list below, under the gListLock. |
30244 | 1222 |
ObjectMonitor *cur_om; |
57906
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|
1223 |
for (cur_om = in_use_list; cur_om != NULL; cur_om = cur_om->_next_om) { |
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|
1224 |
in_use_tail = cur_om; |
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|
1225 |
in_use_count++; |
5920
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|
1226 |
} |
57906
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|
1227 |
guarantee(in_use_tail != NULL, "invariant"); |
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|
1228 |
assert(self->om_in_use_count == in_use_count, "in-use count off"); |
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|
1229 |
self->om_in_use_list = NULL; |
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|
1230 |
self->om_in_use_count = 0; |
26683
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|
1231 |
} |
5920
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changeset
|
1232 |
|
57906
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|
1233 |
Thread::muxAcquire(&gListLock, "om_flush"); |
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|
1234 |
if (free_tail != NULL) { |
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|
1235 |
free_tail->_next_om = g_free_list; |
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|
1236 |
g_free_list = free_list; |
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|
1237 |
g_om_free_count += free_count; |
26683
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|
1238 |
} |
5920
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|
1239 |
|
57906
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changeset
|
1240 |
if (in_use_tail != NULL) { |
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changeset
|
1241 |
in_use_tail->_next_om = g_om_in_use_list; |
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|
1242 |
g_om_in_use_list = in_use_list; |
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|
1243 |
g_om_in_use_count += in_use_count; |
26683
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|
1244 |
} |
5920
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changeset
|
1245 |
|
30244 | 1246 |
Thread::muxRelease(&gListLock); |
54291
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|
1247 |
|
e6c86f6012bf
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changeset
|
1248 |
LogStreamHandle(Debug, monitorinflation) lsh_debug; |
e6c86f6012bf
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changeset
|
1249 |
LogStreamHandle(Info, monitorinflation) lsh_info; |
57906
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changeset
|
1250 |
LogStream* ls = NULL; |
54291
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changeset
|
1251 |
if (log_is_enabled(Debug, monitorinflation)) { |
e6c86f6012bf
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changeset
|
1252 |
ls = &lsh_debug; |
57906
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changeset
|
1253 |
} else if ((free_count != 0 || in_use_count != 0) && |
54291
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changeset
|
1254 |
log_is_enabled(Info, monitorinflation)) { |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
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changeset
|
1255 |
ls = &lsh_info; |
e6c86f6012bf
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changeset
|
1256 |
} |
e6c86f6012bf
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changeset
|
1257 |
if (ls != NULL) { |
57906
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changeset
|
1258 |
ls->print_cr("om_flush: jt=" INTPTR_FORMAT ", free_count=%d" |
e17f768b3b71
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changeset
|
1259 |
", in_use_count=%d" ", om_free_provision=%d", |
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changeset
|
1260 |
p2i(self), free_count, in_use_count, self->om_free_provision); |
54291
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changeset
|
1261 |
} |
1 | 1262 |
} |
1263 |
||
50113 | 1264 |
static void post_monitor_inflate_event(EventJavaMonitorInflate* event, |
1265 |
const oop obj, |
|
1266 |
ObjectSynchronizer::InflateCause cause) { |
|
1267 |
assert(event != NULL, "invariant"); |
|
1268 |
assert(event->should_commit(), "invariant"); |
|
1269 |
event->set_monitorClass(obj->klass()); |
|
1270 |
event->set_address((uintptr_t)(void*)obj); |
|
1271 |
event->set_cause((u1)cause); |
|
1272 |
event->commit(); |
|
1273 |
} |
|
1274 |
||
1 | 1275 |
// Fast path code shared by multiple functions |
53557
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changeset
|
1276 |
void ObjectSynchronizer::inflate_helper(oop obj) { |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
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diff
changeset
|
1277 |
markWord mark = obj->mark(); |
90ead0febf56
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changeset
|
1278 |
if (mark.has_monitor()) { |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
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changeset
|
1279 |
assert(ObjectSynchronizer::verify_objmon_isinpool(mark.monitor()), "monitor is invalid"); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
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changeset
|
1280 |
assert(mark.monitor()->header().is_neutral(), "monitor must record a good object header"); |
53557
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changeset
|
1281 |
return; |
1 | 1282 |
} |
53557
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changeset
|
1283 |
inflate(Thread::current(), obj, inflate_cause_vm_internal); |
1 | 1284 |
} |
1285 |
||
57906
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|
1286 |
ObjectMonitor* ObjectSynchronizer::inflate(Thread* self, |
53557
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|
1287 |
oop object, |
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changeset
|
1288 |
const InflateCause cause) { |
1 | 1289 |
// Inflate mutates the heap ... |
1290 |
// Relaxing assertion for bug 6320749. |
|
25064
244218e6ec0a
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|
1291 |
assert(Universe::verify_in_progress() || |
26683
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changeset
|
1292 |
!SafepointSynchronize::is_at_safepoint(), "invariant"); |
1 | 1293 |
|
35934
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8138562: Event based tracing should cover monitor inflation
dsimms
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changeset
|
1294 |
EventJavaMonitorInflate event; |
76dbe86f3d82
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dsimms
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changeset
|
1295 |
|
1 | 1296 |
for (;;) { |
57777
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changeset
|
1297 |
const markWord mark = object->mark(); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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changeset
|
1298 |
assert(!mark.has_bias_pattern(), "invariant"); |
26683
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changeset
|
1299 |
|
a02753d5a0b2
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|
1300 |
// The mark can be in one of the following states: |
a02753d5a0b2
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|
1301 |
// * Inflated - just return |
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changeset
|
1302 |
// * Stack-locked - coerce it to inflated |
a02753d5a0b2
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changeset
|
1303 |
// * INFLATING - busy wait for conversion to complete |
a02753d5a0b2
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changeset
|
1304 |
// * Neutral - aggressively inflate the object. |
a02753d5a0b2
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|
1305 |
// * BIASED - Illegal. We should never see this |
1 | 1306 |
|
26683
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changeset
|
1307 |
// CASE: inflated |
57777
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changeset
|
1308 |
if (mark.has_monitor()) { |
57906
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changeset
|
1309 |
ObjectMonitor* inf = mark.monitor(); |
57777
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changeset
|
1310 |
markWord dmw = inf->header(); |
90ead0febf56
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changeset
|
1311 |
assert(dmw.is_neutral(), "invariant: header=" INTPTR_FORMAT, dmw.value()); |
58177 | 1312 |
assert(inf->object() == object, "invariant"); |
26683
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changeset
|
1313 |
assert(ObjectSynchronizer::verify_objmon_isinpool(inf), "monitor is invalid"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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diff
changeset
|
1314 |
return inf; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1315 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1316 |
|
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1317 |
// CASE: inflation in progress - inflating over a stack-lock. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1318 |
// Some other thread is converting from stack-locked to inflated. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1319 |
// Only that thread can complete inflation -- other threads must wait. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1320 |
// The INFLATING value is transient. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1321 |
// Currently, we spin/yield/park and poll the markword, waiting for inflation to finish. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1322 |
// We could always eliminate polling by parking the thread on some auxiliary list. |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1323 |
if (mark == markWord::INFLATING()) { |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1324 |
read_stable_mark(object); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1325 |
continue; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1326 |
} |
1 | 1327 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1328 |
// CASE: stack-locked |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
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25633
diff
changeset
|
1329 |
// Could be stack-locked either by this thread or by some other thread. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1330 |
// |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1331 |
// Note that we allocate the objectmonitor speculatively, _before_ attempting |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1332 |
// to install INFLATING into the mark word. We originally installed INFLATING, |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1333 |
// allocated the objectmonitor, and then finally STed the address of the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1334 |
// objectmonitor into the mark. This was correct, but artificially lengthened |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1335 |
// the interval in which INFLATED appeared in the mark, thus increasing |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1336 |
// the odds of inflation contention. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1337 |
// |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1338 |
// We now use per-thread private objectmonitor free lists. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1339 |
// These list are reprovisioned from the global free list outside the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1340 |
// critical INFLATING...ST interval. A thread can transfer |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1341 |
// multiple objectmonitors en-mass from the global free list to its local free list. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1342 |
// This reduces coherency traffic and lock contention on the global free list. |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1343 |
// Using such local free lists, it doesn't matter if the om_alloc() call appears |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1344 |
// before or after the CAS(INFLATING) operation. |
57906
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8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1345 |
// See the comments in om_alloc(). |
1 | 1346 |
|
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1347 |
LogStreamHandle(Trace, monitorinflation) lsh; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1348 |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1349 |
if (mark.has_locker()) { |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1350 |
ObjectMonitor* m = om_alloc(self); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1351 |
// Optimistically prepare the objectmonitor - anticipate successful CAS |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1352 |
// We do this before the CAS in order to minimize the length of time |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1353 |
// in which INFLATING appears in the mark. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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parents:
25633
diff
changeset
|
1354 |
m->Recycle(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1355 |
m->_Responsible = NULL; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1356 |
m->_SpinDuration = ObjectMonitor::Knob_SpinLimit; // Consider: maintain by type/class |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1357 |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1358 |
markWord cmp = object->cas_set_mark(markWord::INFLATING(), mark); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1359 |
if (cmp != mark) { |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1360 |
om_release(self, m, true); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1361 |
continue; // Interference -- just retry |
1 | 1362 |
} |
1363 |
||
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1364 |
// We've successfully installed INFLATING (0) into the mark-word. |
32623
390a27af5657
8134626: Misc cleanups after generation array removal
jwilhelm
parents:
32614
diff
changeset
|
1365 |
// This is the only case where 0 will appear in a mark-word. |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1366 |
// Only the singular thread that successfully swings the mark-word |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1367 |
// to 0 can perform (or more precisely, complete) inflation. |
1 | 1368 |
// |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1369 |
// Why do we CAS a 0 into the mark-word instead of just CASing the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1370 |
// mark-word from the stack-locked value directly to the new inflated state? |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1371 |
// Consider what happens when a thread unlocks a stack-locked object. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1372 |
// It attempts to use CAS to swing the displaced header value from the |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1373 |
// on-stack BasicLock back into the object header. Recall also that the |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1374 |
// header value (hash code, etc) can reside in (a) the object header, or |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1375 |
// (b) a displaced header associated with the stack-lock, or (c) a displaced |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1376 |
// header in an ObjectMonitor. The inflate() routine must copy the header |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1377 |
// value from the BasicLock on the owner's stack to the ObjectMonitor, all |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1378 |
// the while preserving the hashCode stability invariants. If the owner |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1379 |
// decides to release the lock while the value is 0, the unlock will fail |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1380 |
// and control will eventually pass from slow_exit() to inflate. The owner |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1381 |
// will then spin, waiting for the 0 value to disappear. Put another way, |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1382 |
// the 0 causes the owner to stall if the owner happens to try to |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1383 |
// drop the lock (restoring the header from the BasicLock to the object) |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1384 |
// while inflation is in-progress. This protocol avoids races that might |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1385 |
// would otherwise permit hashCode values to change or "flicker" for an object. |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1386 |
// Critically, while object->mark is 0 mark.displaced_mark_helper() is stable. |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1387 |
// 0 serves as a "BUSY" inflate-in-progress indicator. |
1 | 1388 |
|
1389 |
||
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1390 |
// fetch the displaced mark from the owner's stack. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1391 |
// The owner can't die or unwind past the lock while our INFLATING |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1392 |
// object is in the mark. Furthermore the owner can't complete |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1393 |
// an unlock on the object, either. |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1394 |
markWord dmw = mark.displaced_mark_helper(); |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1395 |
// Catch if the object's header is not neutral (not locked and |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1396 |
// not marked is what we care about here). |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1397 |
assert(dmw.is_neutral(), "invariant: header=" INTPTR_FORMAT, dmw.value()); |
1 | 1398 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1399 |
// Setup monitor fields to proper values -- prepare the monitor |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1400 |
m->set_header(dmw); |
1 | 1401 |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1402 |
// Optimization: if the mark.locker stack address is associated |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1403 |
// with this thread we could simply set m->_owner = self. |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1404 |
// Note that a thread can inflate an object |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1405 |
// that it has stack-locked -- as might happen in wait() -- directly |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1406 |
// with CAS. That is, we can avoid the xchg-NULL .... ST idiom. |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1407 |
m->set_owner(mark.locker()); |
1 | 1408 |
m->set_object(object); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1409 |
// TODO-FIXME: assert BasicLock->dhw != 0. |
1 | 1410 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1411 |
// Must preserve store ordering. The monitor state must |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1412 |
// be stable at the time of publishing the monitor address. |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1413 |
guarantee(object->mark() == markWord::INFLATING(), "invariant"); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1414 |
object->release_set_mark(markWord::encode(m)); |
1 | 1415 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1416 |
// Hopefully the performance counters are allocated on distinct cache lines |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1417 |
// to avoid false sharing on MP systems ... |
32614
b7b2407bc7e5
8049304: race between VM_Exit and _sync_FutileWakeups->inc()
dcubed
parents:
31856
diff
changeset
|
1418 |
OM_PERFDATA_OP(Inflations, inc()); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1419 |
if (log_is_enabled(Trace, monitorinflation)) { |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1420 |
ResourceMark rm(self); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1421 |
lsh.print_cr("inflate(has_locker): object=" INTPTR_FORMAT ", mark=" |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1422 |
INTPTR_FORMAT ", type='%s'", p2i(object), |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1423 |
object->mark().value(), object->klass()->external_name()); |
1 | 1424 |
} |
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1425 |
if (event.should_commit()) { |
50113 | 1426 |
post_monitor_inflate_event(&event, object, cause); |
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1427 |
} |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1428 |
return m; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1429 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1430 |
|
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1431 |
// CASE: neutral |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1432 |
// TODO-FIXME: for entry we currently inflate and then try to CAS _owner. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1433 |
// If we know we're inflating for entry it's better to inflate by swinging a |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1434 |
// pre-locked ObjectMonitor pointer into the object header. A successful |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1435 |
// CAS inflates the object *and* confers ownership to the inflating thread. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1436 |
// In the current implementation we use a 2-step mechanism where we CAS() |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1437 |
// to inflate and then CAS() again to try to swing _owner from NULL to self. |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
1438 |
// An inflateTry() method that we could call from enter() would be useful. |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1439 |
|
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1440 |
// Catch if the object's header is not neutral (not locked and |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1441 |
// not marked is what we care about here). |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1442 |
assert(mark.is_neutral(), "invariant: header=" INTPTR_FORMAT, mark.value()); |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1443 |
ObjectMonitor* m = om_alloc(self); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1444 |
// prepare m for installation - set monitor to initial state |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1445 |
m->Recycle(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1446 |
m->set_header(mark); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1447 |
m->set_object(object); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1448 |
m->_Responsible = NULL; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1449 |
m->_SpinDuration = ObjectMonitor::Knob_SpinLimit; // consider: keep metastats by type/class |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1450 |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1451 |
if (object->cas_set_mark(markWord::encode(m), mark) != mark) { |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1452 |
m->set_header(markWord::zero()); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1453 |
m->set_object(NULL); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1454 |
m->Recycle(); |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1455 |
om_release(self, m, true); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1456 |
m = NULL; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1457 |
continue; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1458 |
// interference - the markword changed - just retry. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1459 |
// The state-transitions are one-way, so there's no chance of |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1460 |
// live-lock -- "Inflated" is an absorbing state. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1461 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1462 |
|
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1463 |
// Hopefully the performance counters are allocated on distinct |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1464 |
// cache lines to avoid false sharing on MP systems ... |
32614
b7b2407bc7e5
8049304: race between VM_Exit and _sync_FutileWakeups->inc()
dcubed
parents:
31856
diff
changeset
|
1465 |
OM_PERFDATA_OP(Inflations, inc()); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1466 |
if (log_is_enabled(Trace, monitorinflation)) { |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1467 |
ResourceMark rm(self); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1468 |
lsh.print_cr("inflate(neutral): object=" INTPTR_FORMAT ", mark=" |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1469 |
INTPTR_FORMAT ", type='%s'", p2i(object), |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1470 |
object->mark().value(), object->klass()->external_name()); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1471 |
} |
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1472 |
if (event.should_commit()) { |
50113 | 1473 |
post_monitor_inflate_event(&event, object, cause); |
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1474 |
} |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1475 |
return m; |
1 | 1476 |
} |
1477 |
} |
|
1478 |
||
1479 |
||
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1480 |
// We maintain a list of in-use monitors for each thread. |
1 | 1481 |
// |
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1482 |
// deflate_thread_local_monitors() scans a single thread's in-use list, while |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1483 |
// deflate_idle_monitors() scans only a global list of in-use monitors which |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1484 |
// is populated only as a thread dies (see om_flush()). |
5710 | 1485 |
// |
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1486 |
// These operations are called at all safepoints, immediately after mutators |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1487 |
// are stopped, but before any objects have moved. Collectively they traverse |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1488 |
// the population of in-use monitors, deflating where possible. The scavenged |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1489 |
// monitors are returned to the global monitor free list. |
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1490 |
// |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1491 |
// Beware that we scavenge at *every* stop-the-world point. Having a large |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1492 |
// number of monitors in-use could negatively impact performance. We also want |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1493 |
// to minimize the total # of monitors in circulation, as they incur a small |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1494 |
// footprint penalty. |
1 | 1495 |
// |
1496 |
// Perversely, the heap size -- and thus the STW safepoint rate -- |
|
1497 |
// typically drives the scavenge rate. Large heaps can mean infrequent GC, |
|
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1498 |
// which in turn can mean large(r) numbers of ObjectMonitors in circulation. |
1 | 1499 |
// This is an unfortunate aspect of this design. |
1500 |
||
30244 | 1501 |
// Deflate a single monitor if not in-use |
1502 |
// Return true if deflated, false if in-use |
|
5710 | 1503 |
bool ObjectSynchronizer::deflate_monitor(ObjectMonitor* mid, oop obj, |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1504 |
ObjectMonitor** free_head_p, |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1505 |
ObjectMonitor** free_tail_p) { |
5710 | 1506 |
bool deflated; |
1507 |
// Normal case ... The monitor is associated with obj. |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1508 |
const markWord mark = obj->mark(); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1509 |
guarantee(mark == markWord::encode(mid), "should match: mark=" |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1510 |
INTPTR_FORMAT ", encoded mid=" INTPTR_FORMAT, mark.value(), |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1511 |
markWord::encode(mid).value()); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1512 |
// Make sure that mark.monitor() and markWord::encode() agree: |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1513 |
guarantee(mark.monitor() == mid, "should match: monitor()=" INTPTR_FORMAT |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1514 |
", mid=" INTPTR_FORMAT, p2i(mark.monitor()), p2i(mid)); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1515 |
const markWord dmw = mid->header(); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1516 |
guarantee(dmw.is_neutral(), "invariant: header=" INTPTR_FORMAT, dmw.value()); |
5710 | 1517 |
|
1518 |
if (mid->is_busy()) { |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1519 |
deflated = false; |
5710 | 1520 |
} else { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1521 |
// Deflate the monitor if it is no longer being used |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1522 |
// It's idle - scavenge and return to the global free list |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1523 |
// plain old deflation ... |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1524 |
if (log_is_enabled(Trace, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1525 |
ResourceMark rm; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1526 |
log_trace(monitorinflation)("deflate_monitor: " |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1527 |
"object=" INTPTR_FORMAT ", mark=" |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1528 |
INTPTR_FORMAT ", type='%s'", p2i(obj), |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
1529 |
mark.value(), obj->klass()->external_name()); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1530 |
} |
5710 | 1531 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1532 |
// Restore the header back to obj |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1533 |
obj->release_set_mark(dmw); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1534 |
mid->clear(); |
5710 | 1535 |
|
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1536 |
assert(mid->object() == NULL, "invariant: object=" INTPTR_FORMAT, |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1537 |
p2i(mid->object())); |
5710 | 1538 |
|
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1539 |
// Move the deflated ObjectMonitor to the working free list |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1540 |
// defined by free_head_p and free_tail_p. |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1541 |
if (*free_head_p == NULL) *free_head_p = mid; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1542 |
if (*free_tail_p != NULL) { |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1543 |
// We append to the list so the caller can use mid->_next_om |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1544 |
// to fix the linkages in its context. |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1545 |
ObjectMonitor* prevtail = *free_tail_p; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1546 |
// Should have been cleaned up by the caller: |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1547 |
assert(prevtail->_next_om == NULL, "cleaned up deflated?"); |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1548 |
prevtail->_next_om = mid; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1549 |
} |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1550 |
*free_tail_p = mid; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1551 |
// At this point, mid->_next_om still refers to its current |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1552 |
// value and another ObjectMonitor's _next_om field still |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1553 |
// refers to this ObjectMonitor. Those linkages have to be |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1554 |
// cleaned up by the caller who has the complete context. |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1555 |
deflated = true; |
5710 | 1556 |
} |
1557 |
return deflated; |
|
1558 |
} |
|
1559 |
||
30244 | 1560 |
// Walk a given monitor list, and deflate idle monitors |
1561 |
// The given list could be a per-thread list or a global list |
|
53557
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diff
changeset
|
1562 |
// Caller acquires gListLock as needed. |
46702 | 1563 |
// |
1564 |
// In the case of parallel processing of thread local monitor lists, |
|
1565 |
// work is done by Threads::parallel_threads_do() which ensures that |
|
1566 |
// each Java thread is processed by exactly one worker thread, and |
|
1567 |
// thus avoid conflicts that would arise when worker threads would |
|
1568 |
// process the same monitor lists concurrently. |
|
1569 |
// |
|
1570 |
// See also ParallelSPCleanupTask and |
|
46732
05423d4b10d2
8185273: Test8004741.java crashes with SIGSEGV in JDK10-hs nightly
dcubed
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diff
changeset
|
1571 |
// SafepointSynchronize::do_cleanup_tasks() in safepoint.cpp and |
46702 | 1572 |
// Threads::parallel_java_threads_do() in thread.cpp. |
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changeset
|
1573 |
int ObjectSynchronizer::deflate_monitor_list(ObjectMonitor** list_p, |
e17f768b3b71
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|
1574 |
ObjectMonitor** free_head_p, |
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changeset
|
1575 |
ObjectMonitor** free_tail_p) { |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1576 |
ObjectMonitor* mid; |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
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changeset
|
1577 |
ObjectMonitor* next; |
30244 | 1578 |
ObjectMonitor* cur_mid_in_use = NULL; |
1579 |
int deflated_count = 0; |
|
5920
8fdbb85e62d3
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diff
changeset
|
1580 |
|
57906
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changeset
|
1581 |
for (mid = *list_p; mid != NULL;) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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changeset
|
1582 |
oop obj = (oop) mid->object(); |
57906
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changeset
|
1583 |
if (obj != NULL && deflate_monitor(mid, obj, free_head_p, free_tail_p)) { |
e17f768b3b71
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changeset
|
1584 |
// Deflation succeeded and already updated free_head_p and |
e17f768b3b71
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|
1585 |
// free_tail_p as needed. Finish the move to the local free list |
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|
1586 |
// by unlinking mid from the global or per-thread in-use list. |
e17f768b3b71
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changeset
|
1587 |
if (mid == *list_p) { |
e17f768b3b71
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diff
changeset
|
1588 |
*list_p = mid->_next_om; |
30244 | 1589 |
} else if (cur_mid_in_use != NULL) { |
57906
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changeset
|
1590 |
cur_mid_in_use->_next_om = mid->_next_om; // maintain the current thread in-use list |
26683
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changeset
|
1591 |
} |
57906
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changeset
|
1592 |
next = mid->_next_om; |
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diff
changeset
|
1593 |
mid->_next_om = NULL; // This mid is current tail in the free_head_p list |
26683
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diff
changeset
|
1594 |
mid = next; |
30244 | 1595 |
deflated_count++; |
26683
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changeset
|
1596 |
} else { |
30244 | 1597 |
cur_mid_in_use = mid; |
57906
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changeset
|
1598 |
mid = mid->_next_om; |
5920
8fdbb85e62d3
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parents:
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diff
changeset
|
1599 |
} |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
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changeset
|
1600 |
} |
30244 | 1601 |
return deflated_count; |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
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diff
changeset
|
1602 |
} |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
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diff
changeset
|
1603 |
|
46702 | 1604 |
void ObjectSynchronizer::prepare_deflate_idle_monitors(DeflateMonitorCounters* counters) { |
57906
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diff
changeset
|
1605 |
counters->n_in_use = 0; // currently associated with objects |
e17f768b3b71
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diff
changeset
|
1606 |
counters->n_in_circulation = 0; // extant |
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8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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diff
changeset
|
1607 |
counters->n_scavenged = 0; // reclaimed (global and per-thread) |
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changeset
|
1608 |
counters->per_thread_scavenged = 0; // per-thread scavenge total |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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diff
changeset
|
1609 |
counters->per_thread_times = 0.0; // per-thread scavenge times |
46702 | 1610 |
} |
1611 |
||
1612 |
void ObjectSynchronizer::deflate_idle_monitors(DeflateMonitorCounters* counters) { |
|
1 | 1613 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
5710 | 1614 |
bool deflated = false; |
1 | 1615 |
|
57906
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changeset
|
1616 |
ObjectMonitor* free_head_p = NULL; // Local SLL of scavenged monitors |
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diff
changeset
|
1617 |
ObjectMonitor* free_tail_p = NULL; |
53588
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8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
1618 |
elapsedTimer timer; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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diff
changeset
|
1619 |
|
a5f46c4690f8
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diff
changeset
|
1620 |
if (log_is_enabled(Info, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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diff
changeset
|
1621 |
timer.start(); |
a5f46c4690f8
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diff
changeset
|
1622 |
} |
1 | 1623 |
|
57906
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diff
changeset
|
1624 |
// Prevent om_flush from changing mids in Thread dtor's during deflation |
5710 | 1625 |
// And in case the vm thread is acquiring a lock during a safepoint |
1626 |
// See e.g. 6320749 |
|
53557
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diff
changeset
|
1627 |
Thread::muxAcquire(&gListLock, "deflate_idle_monitors"); |
5710 | 1628 |
|
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1629 |
// Note: the thread-local monitors lists get deflated in |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1630 |
// a separate pass. See deflate_thread_local_monitors(). |
5920
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6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1631 |
|
57906
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diff
changeset
|
1632 |
// For moribund threads, scan g_om_in_use_list |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1633 |
int deflated_count = 0; |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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57893
diff
changeset
|
1634 |
if (g_om_in_use_list) { |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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57893
diff
changeset
|
1635 |
counters->n_in_circulation += g_om_in_use_count; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
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diff
changeset
|
1636 |
deflated_count = deflate_monitor_list((ObjectMonitor **)&g_om_in_use_list, &free_head_p, &free_tail_p); |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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57893
diff
changeset
|
1637 |
g_om_in_use_count -= deflated_count; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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diff
changeset
|
1638 |
counters->n_scavenged += deflated_count; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
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diff
changeset
|
1639 |
counters->n_in_use += g_om_in_use_count; |
1 | 1640 |
} |
1641 |
||
57906
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dcubed
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57893
diff
changeset
|
1642 |
if (free_head_p != NULL) { |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
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57893
diff
changeset
|
1643 |
// Move the deflated ObjectMonitors back to the global free list. |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1644 |
guarantee(free_tail_p != NULL && counters->n_scavenged > 0, "invariant"); |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
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diff
changeset
|
1645 |
assert(free_tail_p->_next_om == NULL, "invariant"); |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
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57893
diff
changeset
|
1646 |
// constant-time list splice - prepend scavenged segment to g_free_list |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1647 |
free_tail_p->_next_om = g_free_list; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1648 |
g_free_list = free_head_p; |
1 | 1649 |
} |
30244 | 1650 |
Thread::muxRelease(&gListLock); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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53557
diff
changeset
|
1651 |
timer.stop(); |
1 | 1652 |
|
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1653 |
LogStreamHandle(Debug, monitorinflation) lsh_debug; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1654 |
LogStreamHandle(Info, monitorinflation) lsh_info; |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
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57893
diff
changeset
|
1655 |
LogStream* ls = NULL; |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1656 |
if (log_is_enabled(Debug, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1657 |
ls = &lsh_debug; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1658 |
} else if (deflated_count != 0 && log_is_enabled(Info, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1659 |
ls = &lsh_info; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1660 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1661 |
if (ls != NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1662 |
ls->print_cr("deflating global idle monitors, %3.7f secs, %d monitors", timer.seconds(), deflated_count); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
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53557
diff
changeset
|
1663 |
} |
46702 | 1664 |
} |
1665 |
||
1666 |
void ObjectSynchronizer::finish_deflate_idle_monitors(DeflateMonitorCounters* counters) { |
|
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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53557
diff
changeset
|
1667 |
// Report the cumulative time for deflating each thread's idle |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
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53557
diff
changeset
|
1668 |
// monitors. Note: if the work is split among more than one |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1669 |
// worker thread, then the reported time will likely be more |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1670 |
// than a beginning to end measurement of the phase. |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
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57893
diff
changeset
|
1671 |
log_info(safepoint, cleanup)("deflating per-thread idle monitors, %3.7f secs, monitors=%d", counters->per_thread_times, counters->per_thread_scavenged); |
53588
a5f46c4690f8
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53557
diff
changeset
|
1672 |
|
57906
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8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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57893
diff
changeset
|
1673 |
g_om_free_count += counters->n_scavenged; |
46702 | 1674 |
|
53588
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8217659: monitor_logging updates from Async Monitor Deflation project
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53557
diff
changeset
|
1675 |
if (log_is_enabled(Debug, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
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53557
diff
changeset
|
1676 |
// exit_globals()'s call to audit_and_print_stats() is done |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
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53557
diff
changeset
|
1677 |
// at the Info level. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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parents:
53557
diff
changeset
|
1678 |
ObjectSynchronizer::audit_and_print_stats(false /* on_exit */); |
54291
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
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changeset
|
1679 |
} else if (log_is_enabled(Info, monitorinflation)) { |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
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changeset
|
1680 |
Thread::muxAcquire(&gListLock, "finish_deflate_idle_monitors"); |
57906
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diff
changeset
|
1681 |
log_info(monitorinflation)("g_om_population=%d, g_om_in_use_count=%d, " |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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changeset
|
1682 |
"g_om_free_count=%d", g_om_population, |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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diff
changeset
|
1683 |
g_om_in_use_count, g_om_free_count); |
54291
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
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53588
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changeset
|
1684 |
Thread::muxRelease(&gListLock); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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53557
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changeset
|
1685 |
} |
46702 | 1686 |
|
59325 | 1687 |
Atomic::store(&_forceMonitorScavenge, 0); // Reset |
46702 | 1688 |
|
57906
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57893
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changeset
|
1689 |
OM_PERFDATA_OP(Deflations, inc(counters->n_scavenged)); |
e17f768b3b71
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diff
changeset
|
1690 |
OM_PERFDATA_OP(MonExtant, set_value(counters->n_in_circulation)); |
1 | 1691 |
|
57906
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changeset
|
1692 |
GVars.stw_random = os::random(); |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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diff
changeset
|
1693 |
GVars.stw_cycle++; |
1 | 1694 |
} |
1695 |
||
46702 | 1696 |
void ObjectSynchronizer::deflate_thread_local_monitors(Thread* thread, DeflateMonitorCounters* counters) { |
1697 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
|
1698 |
||
57906
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changeset
|
1699 |
ObjectMonitor* free_head_p = NULL; // Local SLL of scavenged monitors |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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changeset
|
1700 |
ObjectMonitor* free_tail_p = NULL; |
52703
e7fdc9d9c376
8202415: Incorrect time logged for monitor deflation
dcubed
parents:
52459
diff
changeset
|
1701 |
elapsedTimer timer; |
e7fdc9d9c376
8202415: Incorrect time logged for monitor deflation
dcubed
parents:
52459
diff
changeset
|
1702 |
|
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
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diff
changeset
|
1703 |
if (log_is_enabled(Info, safepoint, cleanup) || |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1704 |
log_is_enabled(Info, monitorinflation)) { |
52703
e7fdc9d9c376
8202415: Incorrect time logged for monitor deflation
dcubed
parents:
52459
diff
changeset
|
1705 |
timer.start(); |
e7fdc9d9c376
8202415: Incorrect time logged for monitor deflation
dcubed
parents:
52459
diff
changeset
|
1706 |
} |
46702 | 1707 |
|
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1708 |
int deflated_count = deflate_monitor_list(thread->om_in_use_list_addr(), &free_head_p, &free_tail_p); |
46702 | 1709 |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1710 |
Thread::muxAcquire(&gListLock, "deflate_thread_local_monitors"); |
46702 | 1711 |
|
1712 |
// Adjust counters |
|
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
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diff
changeset
|
1713 |
counters->n_in_circulation += thread->om_in_use_count; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1714 |
thread->om_in_use_count -= deflated_count; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1715 |
counters->n_scavenged += deflated_count; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1716 |
counters->n_in_use += thread->om_in_use_count; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1717 |
counters->per_thread_scavenged += deflated_count; |
46702 | 1718 |
|
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1719 |
if (free_head_p != NULL) { |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1720 |
// Move the deflated ObjectMonitors back to the global free list. |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1721 |
guarantee(free_tail_p != NULL && deflated_count > 0, "invariant"); |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1722 |
assert(free_tail_p->_next_om == NULL, "invariant"); |
46702 | 1723 |
|
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1724 |
// constant-time list splice - prepend scavenged segment to g_free_list |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1725 |
free_tail_p->_next_om = g_free_list; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1726 |
g_free_list = free_head_p; |
46702 | 1727 |
} |
54291
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1728 |
|
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1729 |
timer.stop(); |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1730 |
// Safepoint logging cares about cumulative per_thread_times and |
54291
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1731 |
// we'll capture most of the cost, but not the muxRelease() which |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1732 |
// should be cheap. |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1733 |
counters->per_thread_times += timer.seconds(); |
54291
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1734 |
|
46702 | 1735 |
Thread::muxRelease(&gListLock); |
54291
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1736 |
|
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
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parents:
53588
diff
changeset
|
1737 |
LogStreamHandle(Debug, monitorinflation) lsh_debug; |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1738 |
LogStreamHandle(Info, monitorinflation) lsh_info; |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1739 |
LogStream* ls = NULL; |
54291
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1740 |
if (log_is_enabled(Debug, monitorinflation)) { |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1741 |
ls = &lsh_debug; |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1742 |
} else if (deflated_count != 0 && log_is_enabled(Info, monitorinflation)) { |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1743 |
ls = &lsh_info; |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1744 |
} |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1745 |
if (ls != NULL) { |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1746 |
ls->print_cr("jt=" INTPTR_FORMAT ": deflating per-thread idle monitors, %3.7f secs, %d monitors", p2i(thread), timer.seconds(), deflated_count); |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1747 |
} |
46702 | 1748 |
} |
1749 |
||
6975 | 1750 |
// Monitor cleanup on JavaThread::exit |
1 | 1751 |
|
6975 | 1752 |
// Iterate through monitor cache and attempt to release thread's monitors |
1753 |
// Gives up on a particular monitor if an exception occurs, but continues |
|
1754 |
// the overall iteration, swallowing the exception. |
|
1755 |
class ReleaseJavaMonitorsClosure: public MonitorClosure { |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1756 |
private: |
6975 | 1757 |
TRAPS; |
1 | 1758 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1759 |
public: |
6975 | 1760 |
ReleaseJavaMonitorsClosure(Thread* thread) : THREAD(thread) {} |
1761 |
void do_monitor(ObjectMonitor* mid) { |
|
1762 |
if (mid->owner() == THREAD) { |
|
1763 |
(void)mid->complete_exit(CHECK); |
|
1 | 1764 |
} |
1765 |
} |
|
6975 | 1766 |
}; |
1 | 1767 |
|
6975 | 1768 |
// Release all inflated monitors owned by THREAD. Lightweight monitors are |
1769 |
// ignored. This is meant to be called during JNI thread detach which assumes |
|
1770 |
// all remaining monitors are heavyweight. All exceptions are swallowed. |
|
1771 |
// Scanning the extant monitor list can be time consuming. |
|
1772 |
// A simple optimization is to add a per-thread flag that indicates a thread |
|
1773 |
// called jni_monitorenter() during its lifetime. |
|
1 | 1774 |
// |
6975 | 1775 |
// Instead of No_Savepoint_Verifier it might be cheaper to |
1776 |
// use an idiom of the form: |
|
1777 |
// auto int tmp = SafepointSynchronize::_safepoint_counter ; |
|
1778 |
// <code that must not run at safepoint> |
|
1779 |
// guarantee (((tmp ^ _safepoint_counter) | (tmp & 1)) == 0) ; |
|
1780 |
// Since the tests are extremely cheap we could leave them enabled |
|
1781 |
// for normal product builds. |
|
1 | 1782 |
|
6975 | 1783 |
void ObjectSynchronizer::release_monitors_owned_by_thread(TRAPS) { |
1784 |
assert(THREAD == JavaThread::current(), "must be current Java thread"); |
|
35492
c8c0273e6b91
8146690: Make all classes in GC follow the naming convention.
david
parents:
35171
diff
changeset
|
1785 |
NoSafepointVerifier nsv; |
6975 | 1786 |
ReleaseJavaMonitorsClosure rjmc(THREAD); |
30244 | 1787 |
Thread::muxAcquire(&gListLock, "release_monitors_owned_by_thread"); |
6975 | 1788 |
ObjectSynchronizer::monitors_iterate(&rjmc); |
30244 | 1789 |
Thread::muxRelease(&gListLock); |
6975 | 1790 |
THREAD->clear_pending_exception(); |
1 | 1791 |
} |
1792 |
||
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1793 |
const char* ObjectSynchronizer::inflate_cause_name(const InflateCause cause) { |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1794 |
switch (cause) { |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1795 |
case inflate_cause_vm_internal: return "VM Internal"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1796 |
case inflate_cause_monitor_enter: return "Monitor Enter"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1797 |
case inflate_cause_wait: return "Monitor Wait"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1798 |
case inflate_cause_notify: return "Monitor Notify"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1799 |
case inflate_cause_hash_code: return "Monitor Hash Code"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1800 |
case inflate_cause_jni_enter: return "JNI Monitor Enter"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1801 |
case inflate_cause_jni_exit: return "JNI Monitor Exit"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1802 |
default: |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1803 |
ShouldNotReachHere(); |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1804 |
} |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1805 |
return "Unknown"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1806 |
} |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1807 |
|
1 | 1808 |
//------------------------------------------------------------------------------ |
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1809 |
// Debugging code |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1810 |
|
51258 | 1811 |
u_char* ObjectSynchronizer::get_gvars_addr() { |
1812 |
return (u_char*)&GVars; |
|
1813 |
} |
|
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1814 |
|
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1815 |
u_char* ObjectSynchronizer::get_gvars_hc_sequence_addr() { |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1816 |
return (u_char*)&GVars.hc_sequence; |
51258 | 1817 |
} |
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1818 |
|
51258 | 1819 |
size_t ObjectSynchronizer::get_gvars_size() { |
1820 |
return sizeof(SharedGlobals); |
|
1821 |
} |
|
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1822 |
|
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1823 |
u_char* ObjectSynchronizer::get_gvars_stw_random_addr() { |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1824 |
return (u_char*)&GVars.stw_random; |
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1825 |
} |
1 | 1826 |
|
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1827 |
void ObjectSynchronizer::audit_and_print_stats(bool on_exit) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1828 |
assert(on_exit || SafepointSynchronize::is_at_safepoint(), "invariant"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1829 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1830 |
LogStreamHandle(Debug, monitorinflation) lsh_debug; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1831 |
LogStreamHandle(Info, monitorinflation) lsh_info; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1832 |
LogStreamHandle(Trace, monitorinflation) lsh_trace; |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1833 |
LogStream* ls = NULL; |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1834 |
if (log_is_enabled(Trace, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1835 |
ls = &lsh_trace; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1836 |
} else if (log_is_enabled(Debug, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1837 |
ls = &lsh_debug; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1838 |
} else if (log_is_enabled(Info, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1839 |
ls = &lsh_info; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1840 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1841 |
assert(ls != NULL, "sanity check"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1842 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1843 |
if (!on_exit) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1844 |
// Not at VM exit so grab the global list lock. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1845 |
Thread::muxAcquire(&gListLock, "audit_and_print_stats"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1846 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1847 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1848 |
// Log counts for the global and per-thread monitor lists: |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1849 |
int chk_om_population = log_monitor_list_counts(ls); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1850 |
int error_cnt = 0; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1851 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1852 |
ls->print_cr("Checking global lists:"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1853 |
|
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1854 |
// Check g_om_population: |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1855 |
if (g_om_population == chk_om_population) { |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1856 |
ls->print_cr("g_om_population=%d equals chk_om_population=%d", |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
1857 |
g_om_population, chk_om_population); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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|
1858 |
} else { |
57906
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changeset
|
1859 |
ls->print_cr("ERROR: g_om_population=%d is not equal to " |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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changeset
|
1860 |
"chk_om_population=%d", g_om_population, |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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changeset
|
1861 |
chk_om_population); |
54291
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|
1862 |
error_cnt++; |
53588
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|
1863 |
} |
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changeset
|
1864 |
|
57906
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8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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changeset
|
1865 |
// Check g_om_in_use_list and g_om_in_use_count: |
53588
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changeset
|
1866 |
chk_global_in_use_list_and_count(ls, &error_cnt); |
a5f46c4690f8
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changeset
|
1867 |
|
57906
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changeset
|
1868 |
// Check g_free_list and g_om_free_count: |
53588
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changeset
|
1869 |
chk_global_free_list_and_count(ls, &error_cnt); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
1870 |
|
a5f46c4690f8
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changeset
|
1871 |
if (!on_exit) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
1872 |
Thread::muxRelease(&gListLock); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
1873 |
} |
a5f46c4690f8
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changeset
|
1874 |
|
a5f46c4690f8
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changeset
|
1875 |
ls->print_cr("Checking per-thread lists:"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
1876 |
|
a5f46c4690f8
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changeset
|
1877 |
for (JavaThreadIteratorWithHandle jtiwh; JavaThread *jt = jtiwh.next(); ) { |
57906
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changeset
|
1878 |
// Check om_in_use_list and om_in_use_count: |
53588
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changeset
|
1879 |
chk_per_thread_in_use_list_and_count(jt, ls, &error_cnt); |
a5f46c4690f8
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changeset
|
1880 |
|
57906
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8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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changeset
|
1881 |
// Check om_free_list and om_free_count: |
53588
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8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
1882 |
chk_per_thread_free_list_and_count(jt, ls, &error_cnt); |
a5f46c4690f8
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changeset
|
1883 |
} |
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changeset
|
1884 |
|
a5f46c4690f8
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changeset
|
1885 |
if (error_cnt == 0) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
1886 |
ls->print_cr("No errors found in monitor list checks."); |
a5f46c4690f8
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changeset
|
1887 |
} else { |
a5f46c4690f8
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changeset
|
1888 |
log_error(monitorinflation)("found monitor list errors: error_cnt=%d", error_cnt); |
a5f46c4690f8
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changeset
|
1889 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
1890 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
1891 |
if ((on_exit && log_is_enabled(Info, monitorinflation)) || |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
1892 |
(!on_exit && log_is_enabled(Trace, monitorinflation))) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
1893 |
// When exiting this log output is at the Info level. When called |
a5f46c4690f8
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changeset
|
1894 |
// at a safepoint, this log output is at the Trace level since |
a5f46c4690f8
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changeset
|
1895 |
// there can be a lot of it. |
a5f46c4690f8
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changeset
|
1896 |
log_in_use_monitor_details(ls, on_exit); |
a5f46c4690f8
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changeset
|
1897 |
} |
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changeset
|
1898 |
|
a5f46c4690f8
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changeset
|
1899 |
ls->flush(); |
a5f46c4690f8
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changeset
|
1900 |
|
a5f46c4690f8
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changeset
|
1901 |
guarantee(error_cnt == 0, "ERROR: found monitor list errors: error_cnt=%d", error_cnt); |
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changeset
|
1902 |
} |
a5f46c4690f8
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changeset
|
1903 |
|
a5f46c4690f8
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changeset
|
1904 |
// Check a free monitor entry; log any errors. |
57906
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changeset
|
1905 |
void ObjectSynchronizer::chk_free_entry(JavaThread* jt, ObjectMonitor* n, |
53588
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|
1906 |
outputStream * out, int *error_cnt_p) { |
55345
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
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changeset
|
1907 |
stringStream ss; |
53588
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changeset
|
1908 |
if (n->is_busy()) { |
a5f46c4690f8
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changeset
|
1909 |
if (jt != NULL) { |
a5f46c4690f8
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changeset
|
1910 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
55345
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changeset
|
1911 |
": free per-thread monitor must not be busy: %s", p2i(jt), |
492b644bb9c2
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changeset
|
1912 |
p2i(n), n->is_busy_to_string(&ss)); |
53588
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changeset
|
1913 |
} else { |
a5f46c4690f8
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changeset
|
1914 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": free global monitor " |
55345
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changeset
|
1915 |
"must not be busy: %s", p2i(n), n->is_busy_to_string(&ss)); |
53588
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changeset
|
1916 |
} |
a5f46c4690f8
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changeset
|
1917 |
*error_cnt_p = *error_cnt_p + 1; |
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changeset
|
1918 |
} |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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parents:
57734
diff
changeset
|
1919 |
if (n->header().value() != 0) { |
53588
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changeset
|
1920 |
if (jt != NULL) { |
a5f46c4690f8
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changeset
|
1921 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
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changeset
|
1922 |
": free per-thread monitor must have NULL _header " |
a5f46c4690f8
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changeset
|
1923 |
"field: _header=" INTPTR_FORMAT, p2i(jt), p2i(n), |
57777
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8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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diff
changeset
|
1924 |
n->header().value()); |
53588
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changeset
|
1925 |
} else { |
a5f46c4690f8
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changeset
|
1926 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": free global monitor " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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parents:
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changeset
|
1927 |
"must have NULL _header field: _header=" INTPTR_FORMAT, |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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parents:
57734
diff
changeset
|
1928 |
p2i(n), n->header().value()); |
53588
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changeset
|
1929 |
} |
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changeset
|
1930 |
*error_cnt_p = *error_cnt_p + 1; |
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changeset
|
1931 |
} |
a5f46c4690f8
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changeset
|
1932 |
if (n->object() != NULL) { |
a5f46c4690f8
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changeset
|
1933 |
if (jt != NULL) { |
a5f46c4690f8
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changeset
|
1934 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
a5f46c4690f8
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53557
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changeset
|
1935 |
": free per-thread monitor must have NULL _object " |
a5f46c4690f8
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diff
changeset
|
1936 |
"field: _object=" INTPTR_FORMAT, p2i(jt), p2i(n), |
a5f46c4690f8
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changeset
|
1937 |
p2i(n->object())); |
a5f46c4690f8
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diff
changeset
|
1938 |
} else { |
a5f46c4690f8
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changeset
|
1939 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": free global monitor " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
1940 |
"must have NULL _object field: _object=" INTPTR_FORMAT, |
a5f46c4690f8
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parents:
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changeset
|
1941 |
p2i(n), p2i(n->object())); |
a5f46c4690f8
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diff
changeset
|
1942 |
} |
a5f46c4690f8
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changeset
|
1943 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
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parents:
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diff
changeset
|
1944 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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diff
changeset
|
1945 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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diff
changeset
|
1946 |
|
a5f46c4690f8
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diff
changeset
|
1947 |
// Check the global free list and count; log the results of the checks. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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parents:
53557
diff
changeset
|
1948 |
void ObjectSynchronizer::chk_global_free_list_and_count(outputStream * out, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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parents:
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changeset
|
1949 |
int *error_cnt_p) { |
57906
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8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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parents:
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changeset
|
1950 |
int chk_om_free_count = 0; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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parents:
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diff
changeset
|
1951 |
for (ObjectMonitor* n = g_free_list; n != NULL; n = n->_next_om) { |
53588
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parents:
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changeset
|
1952 |
chk_free_entry(NULL /* jt */, n, out, error_cnt_p); |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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changeset
|
1953 |
chk_om_free_count++; |
53588
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changeset
|
1954 |
} |
57906
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8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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parents:
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changeset
|
1955 |
if (g_om_free_count == chk_om_free_count) { |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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parents:
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diff
changeset
|
1956 |
out->print_cr("g_om_free_count=%d equals chk_om_free_count=%d", |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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parents:
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diff
changeset
|
1957 |
g_om_free_count, chk_om_free_count); |
53588
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parents:
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changeset
|
1958 |
} else { |
57906
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8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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parents:
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diff
changeset
|
1959 |
out->print_cr("ERROR: g_om_free_count=%d is not equal to " |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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parents:
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diff
changeset
|
1960 |
"chk_om_free_count=%d", g_om_free_count, |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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parents:
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diff
changeset
|
1961 |
chk_om_free_count); |
53588
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8217659: monitor_logging updates from Async Monitor Deflation project
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parents:
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diff
changeset
|
1962 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
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parents:
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diff
changeset
|
1963 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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parents:
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diff
changeset
|
1964 |
} |
a5f46c4690f8
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parents:
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diff
changeset
|
1965 |
|
a5f46c4690f8
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parents:
53557
diff
changeset
|
1966 |
// Check the global in-use list and count; log the results of the checks. |
a5f46c4690f8
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parents:
53557
diff
changeset
|
1967 |
void ObjectSynchronizer::chk_global_in_use_list_and_count(outputStream * out, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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parents:
53557
diff
changeset
|
1968 |
int *error_cnt_p) { |
57906
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8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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parents:
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diff
changeset
|
1969 |
int chk_om_in_use_count = 0; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
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parents:
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diff
changeset
|
1970 |
for (ObjectMonitor* n = g_om_in_use_list; n != NULL; n = n->_next_om) { |
53588
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parents:
53557
diff
changeset
|
1971 |
chk_in_use_entry(NULL /* jt */, n, out, error_cnt_p); |
57906
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|
1972 |
chk_om_in_use_count++; |
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|
1973 |
} |
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|
1974 |
if (g_om_in_use_count == chk_om_in_use_count) { |
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|
1975 |
out->print_cr("g_om_in_use_count=%d equals chk_om_in_use_count=%d", g_om_in_use_count, |
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|
1976 |
chk_om_in_use_count); |
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|
1977 |
} else { |
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|
1978 |
out->print_cr("ERROR: g_om_in_use_count=%d is not equal to chk_om_in_use_count=%d", |
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|
1979 |
g_om_in_use_count, chk_om_in_use_count); |
53588
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|
1980 |
*error_cnt_p = *error_cnt_p + 1; |
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|
1981 |
} |
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changeset
|
1982 |
} |
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changeset
|
1983 |
|
a5f46c4690f8
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|
1984 |
// Check an in-use monitor entry; log any errors. |
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|
1985 |
void ObjectSynchronizer::chk_in_use_entry(JavaThread* jt, ObjectMonitor* n, |
53588
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|
1986 |
outputStream * out, int *error_cnt_p) { |
57777
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|
1987 |
if (n->header().value() == 0) { |
53588
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|
1988 |
if (jt != NULL) { |
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changeset
|
1989 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
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|
1990 |
": in-use per-thread monitor must have non-NULL _header " |
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changeset
|
1991 |
"field.", p2i(jt), p2i(n)); |
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|
1992 |
} else { |
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changeset
|
1993 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": in-use global monitor " |
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|
1994 |
"must have non-NULL _header field.", p2i(n)); |
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|
1995 |
} |
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|
1996 |
*error_cnt_p = *error_cnt_p + 1; |
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|
1997 |
} |
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|
1998 |
if (n->object() == NULL) { |
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changeset
|
1999 |
if (jt != NULL) { |
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changeset
|
2000 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
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|
2001 |
": in-use per-thread monitor must have non-NULL _object " |
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changeset
|
2002 |
"field.", p2i(jt), p2i(n)); |
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|
2003 |
} else { |
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changeset
|
2004 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": in-use global monitor " |
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changeset
|
2005 |
"must have non-NULL _object field.", p2i(n)); |
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|
2006 |
} |
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changeset
|
2007 |
*error_cnt_p = *error_cnt_p + 1; |
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|
2008 |
} |
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changeset
|
2009 |
const oop obj = (oop)n->object(); |
57777
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changeset
|
2010 |
const markWord mark = obj->mark(); |
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changeset
|
2011 |
if (!mark.has_monitor()) { |
53588
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changeset
|
2012 |
if (jt != NULL) { |
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parents:
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changeset
|
2013 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
a5f46c4690f8
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changeset
|
2014 |
": in-use per-thread monitor's object does not think " |
a5f46c4690f8
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parents:
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diff
changeset
|
2015 |
"it has a monitor: obj=" INTPTR_FORMAT ", mark=" |
57777
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changeset
|
2016 |
INTPTR_FORMAT, p2i(jt), p2i(n), p2i(obj), mark.value()); |
53588
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changeset
|
2017 |
} else { |
a5f46c4690f8
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changeset
|
2018 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": in-use global " |
a5f46c4690f8
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changeset
|
2019 |
"monitor's object does not think it has a monitor: obj=" |
a5f46c4690f8
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parents:
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changeset
|
2020 |
INTPTR_FORMAT ", mark=" INTPTR_FORMAT, p2i(n), |
57777
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changeset
|
2021 |
p2i(obj), mark.value()); |
53588
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changeset
|
2022 |
} |
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changeset
|
2023 |
*error_cnt_p = *error_cnt_p + 1; |
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changeset
|
2024 |
} |
57906
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changeset
|
2025 |
ObjectMonitor* const obj_mon = mark.monitor(); |
53588
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changeset
|
2026 |
if (n != obj_mon) { |
a5f46c4690f8
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changeset
|
2027 |
if (jt != NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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diff
changeset
|
2028 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
a5f46c4690f8
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diff
changeset
|
2029 |
": in-use per-thread monitor's object does not refer " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
2030 |
"to the same monitor: obj=" INTPTR_FORMAT ", mark=" |
a5f46c4690f8
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changeset
|
2031 |
INTPTR_FORMAT ", obj_mon=" INTPTR_FORMAT, p2i(jt), |
57777
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8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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parents:
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changeset
|
2032 |
p2i(n), p2i(obj), mark.value(), p2i(obj_mon)); |
53588
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changeset
|
2033 |
} else { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
2034 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": in-use global " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
2035 |
"monitor's object does not refer to the same monitor: obj=" |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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changeset
|
2036 |
INTPTR_FORMAT ", mark=" INTPTR_FORMAT ", obj_mon=" |
57777
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8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
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diff
changeset
|
2037 |
INTPTR_FORMAT, p2i(n), p2i(obj), mark.value(), p2i(obj_mon)); |
53588
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changeset
|
2038 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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diff
changeset
|
2039 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2040 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
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changeset
|
2041 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
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diff
changeset
|
2042 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
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53557
diff
changeset
|
2043 |
// Check the thread's free list and count; log the results of the checks. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2044 |
void ObjectSynchronizer::chk_per_thread_free_list_and_count(JavaThread *jt, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
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changeset
|
2045 |
outputStream * out, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2046 |
int *error_cnt_p) { |
57906
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changeset
|
2047 |
int chk_om_free_count = 0; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
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diff
changeset
|
2048 |
for (ObjectMonitor* n = jt->om_free_list; n != NULL; n = n->_next_om) { |
53588
a5f46c4690f8
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53557
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changeset
|
2049 |
chk_free_entry(jt, n, out, error_cnt_p); |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
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changeset
|
2050 |
chk_om_free_count++; |
53588
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53557
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changeset
|
2051 |
} |
57906
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8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2052 |
if (jt->om_free_count == chk_om_free_count) { |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
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changeset
|
2053 |
out->print_cr("jt=" INTPTR_FORMAT ": om_free_count=%d equals " |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
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diff
changeset
|
2054 |
"chk_om_free_count=%d", p2i(jt), jt->om_free_count, chk_om_free_count); |
53588
a5f46c4690f8
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changeset
|
2055 |
} else { |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2056 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ": om_free_count=%d is not " |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2057 |
"equal to chk_om_free_count=%d", p2i(jt), jt->om_free_count, |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
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diff
changeset
|
2058 |
chk_om_free_count); |
53588
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8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
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changeset
|
2059 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2060 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2061 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2062 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2063 |
// Check the thread's in-use list and count; log the results of the checks. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2064 |
void ObjectSynchronizer::chk_per_thread_in_use_list_and_count(JavaThread *jt, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
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diff
changeset
|
2065 |
outputStream * out, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2066 |
int *error_cnt_p) { |
57906
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8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2067 |
int chk_om_in_use_count = 0; |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2068 |
for (ObjectMonitor* n = jt->om_in_use_list; n != NULL; n = n->_next_om) { |
53588
a5f46c4690f8
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dcubed
parents:
53557
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changeset
|
2069 |
chk_in_use_entry(jt, n, out, error_cnt_p); |
57906
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8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
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diff
changeset
|
2070 |
chk_om_in_use_count++; |
53588
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dcubed
parents:
53557
diff
changeset
|
2071 |
} |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2072 |
if (jt->om_in_use_count == chk_om_in_use_count) { |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
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diff
changeset
|
2073 |
out->print_cr("jt=" INTPTR_FORMAT ": om_in_use_count=%d equals " |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2074 |
"chk_om_in_use_count=%d", p2i(jt), jt->om_in_use_count, |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
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diff
changeset
|
2075 |
chk_om_in_use_count); |
53588
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8217659: monitor_logging updates from Async Monitor Deflation project
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parents:
53557
diff
changeset
|
2076 |
} else { |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2077 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ": om_in_use_count=%d is not " |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2078 |
"equal to chk_om_in_use_count=%d", p2i(jt), jt->om_in_use_count, |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
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diff
changeset
|
2079 |
chk_om_in_use_count); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2080 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2081 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2082 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2083 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2084 |
// Log details about ObjectMonitors on the in-use lists. The 'BHL' |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2085 |
// flags indicate why the entry is in-use, 'object' and 'object type' |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2086 |
// indicate the associated object and its type. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2087 |
void ObjectSynchronizer::log_in_use_monitor_details(outputStream * out, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2088 |
bool on_exit) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2089 |
if (!on_exit) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2090 |
// Not at VM exit so grab the global list lock. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2091 |
Thread::muxAcquire(&gListLock, "log_in_use_monitor_details"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2092 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2093 |
|
55345
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2094 |
stringStream ss; |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
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diff
changeset
|
2095 |
if (g_om_in_use_count > 0) { |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2096 |
out->print_cr("In-use global monitor info:"); |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
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parents:
54291
diff
changeset
|
2097 |
out->print_cr("(B -> is_busy, H -> has hash code, L -> lock status)"); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
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parents:
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diff
changeset
|
2098 |
out->print_cr("%18s %s %18s %18s", |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
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diff
changeset
|
2099 |
"monitor", "BHL", "object", "object type"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2100 |
out->print_cr("================== === ================== =================="); |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
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diff
changeset
|
2101 |
for (ObjectMonitor* n = g_om_in_use_list; n != NULL; n = n->_next_om) { |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2102 |
const oop obj = (oop) n->object(); |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
2103 |
const markWord mark = n->header(); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2104 |
ResourceMark rm; |
55345
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2105 |
out->print(INTPTR_FORMAT " %d%d%d " INTPTR_FORMAT " %s", p2i(n), |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
2106 |
n->is_busy() != 0, mark.hash() != 0, n->owner() != NULL, |
55345
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
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diff
changeset
|
2107 |
p2i(obj), obj->klass()->external_name()); |
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2108 |
if (n->is_busy() != 0) { |
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2109 |
out->print(" (%s)", n->is_busy_to_string(&ss)); |
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2110 |
ss.reset(); |
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2111 |
} |
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2112 |
out->cr(); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2113 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2114 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2115 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2116 |
if (!on_exit) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2117 |
Thread::muxRelease(&gListLock); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2118 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2119 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2120 |
out->print_cr("In-use per-thread monitor info:"); |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
2121 |
out->print_cr("(B -> is_busy, H -> has hash code, L -> lock status)"); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2122 |
out->print_cr("%18s %18s %s %18s %18s", |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2123 |
"jt", "monitor", "BHL", "object", "object type"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2124 |
out->print_cr("================== ================== === ================== =================="); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2125 |
for (JavaThreadIteratorWithHandle jtiwh; JavaThread *jt = jtiwh.next(); ) { |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2126 |
for (ObjectMonitor* n = jt->om_in_use_list; n != NULL; n = n->_next_om) { |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2127 |
const oop obj = (oop) n->object(); |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
2128 |
const markWord mark = n->header(); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2129 |
ResourceMark rm; |
55345
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2130 |
out->print(INTPTR_FORMAT " " INTPTR_FORMAT " %d%d%d " INTPTR_FORMAT |
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2131 |
" %s", p2i(jt), p2i(n), n->is_busy() != 0, |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
57734
diff
changeset
|
2132 |
mark.hash() != 0, n->owner() != NULL, p2i(obj), |
55345
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2133 |
obj->klass()->external_name()); |
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2134 |
if (n->is_busy() != 0) { |
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2135 |
out->print(" (%s)", n->is_busy_to_string(&ss)); |
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2136 |
ss.reset(); |
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2137 |
} |
492b644bb9c2
8225453: is_busy diagnostics and other baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54786
diff
changeset
|
2138 |
out->cr(); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2139 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2140 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2141 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2142 |
out->flush(); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2143 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2144 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2145 |
// Log counts for the global and per-thread monitor lists and return |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2146 |
// the population count. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2147 |
int ObjectSynchronizer::log_monitor_list_counts(outputStream * out) { |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2148 |
int pop_count = 0; |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2149 |
out->print_cr("%18s %10s %10s %10s", |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2150 |
"Global Lists:", "InUse", "Free", "Total"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2151 |
out->print_cr("================== ========== ========== =========="); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2152 |
out->print_cr("%18s %10d %10d %10d", "", |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2153 |
g_om_in_use_count, g_om_free_count, g_om_population); |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2154 |
pop_count += g_om_in_use_count + g_om_free_count; |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2155 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2156 |
out->print_cr("%18s %10s %10s %10s", |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2157 |
"Per-Thread Lists:", "InUse", "Free", "Provision"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2158 |
out->print_cr("================== ========== ========== =========="); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2159 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2160 |
for (JavaThreadIteratorWithHandle jtiwh; JavaThread *jt = jtiwh.next(); ) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2161 |
out->print_cr(INTPTR_FORMAT " %10d %10d %10d", p2i(jt), |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2162 |
jt->om_in_use_count, jt->om_free_count, jt->om_free_provision); |
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2163 |
pop_count += jt->om_in_use_count + jt->om_free_count; |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2164 |
} |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2165 |
return pop_count; |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2166 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2167 |
|
1 | 2168 |
#ifndef PRODUCT |
2169 |
||
2170 |
// Check if monitor belongs to the monitor cache |
|
2171 |
// The list is grow-only so it's *relatively* safe to traverse |
|
2172 |
// the list of extant blocks without taking a lock. |
|
2173 |
||
2174 |
int ObjectSynchronizer::verify_objmon_isinpool(ObjectMonitor *monitor) { |
|
59247
56bf71d64d51
8234562: Move OrderAccess::release_store*/load_acquire to Atomic
stefank
parents:
59225
diff
changeset
|
2175 |
PaddedObjectMonitor* block = Atomic::load_acquire(&g_block_list); |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
2176 |
while (block != NULL) { |
1 | 2177 |
assert(block->object() == CHAINMARKER, "must be a block header"); |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
2178 |
if (monitor > &block[0] && monitor < &block[_BLOCKSIZE]) { |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
2179 |
address mon = (address)monitor; |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
2180 |
address blk = (address)block; |
1 | 2181 |
size_t diff = mon - blk; |
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2182 |
assert((diff % sizeof(PaddedObjectMonitor)) == 0, "must be aligned"); |
1 | 2183 |
return 1; |
2184 |
} |
|
57906
e17f768b3b71
8230184: rename, whitespace, indent and comments changes in preparation for lock free Monitor lists
dcubed
parents:
57893
diff
changeset
|
2185 |
block = (PaddedObjectMonitor*)block->_next_om; |
1 | 2186 |
} |
2187 |
return 0; |
|
2188 |
} |
|
2189 |
||
2190 |
#endif |